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C3700,N600
User Manual
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NETGEAR C3700,N600 User Manual

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User Manual
N600 WiFi Cable Modem Router C3700
March 2021 202-12218-01
NETGEAR, Inc. 350 East Plumeria Drive San Jose, CA 95134, USA
Support and Community
Visit netgear.com/support to get your questions answered and access the latest downloads.
You can also check out our NETGEAR Community for helpful advice at community.netgear.com.
Customer-owned cable devices might not be compatible with certain cable networks. Check with your
cable Internet provider to confirm that this NETGEAR cable device is allowed on your cable network.
If you are experiencing trouble installing your cable device, contact NETGEAR at 1-866-874-8924.
Note to CATV system installer: This reminder is provided to call the CATV systems installer’s attention
to Section 820-93 of the National Electrical Code, which provide guidelines for proper grounding
and in particular, specify that coaxial cable shield shall be connected to the grounding system of the
building, as close to the point of cable entry as practical.
Regulatory and Legal
Si ce produit est vendu au Canada, vous pouvez accéder à ce document en français canadien à
https://www.netgear.com/support/download/.
(If this product is sold in Canada, you can access this document in Canadian French at
https://www.netgear.com/support/download/.)
For regulatory compliance information including the EU Declaration of Conformity, visit
https://www.netgear.com/about/regulatory/.
See the regulatory compliance document before connecting the power supply. For NETGEAR’s Privacy
Policy, visit https://www.netgear.com/about/privacy-policy.
By using this device, you are agreeing to NETGEAR’s Terms and Conditions at
https://www.netgear.com/about/terms-and-conditions. If you do not agree, return the device to your
place of purchase within your return period.
Trademarks
©NETGEAR, Inc. NETGEAR and the NETGEAR Logo are trademarks of NETGEAR.
User Manual2

Contents

Chapter 1 Hardware Setup
Chapter 2 Connect to the Network and Access the Modem Router
Unpack Your Modem Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Position Your Gateway. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Cable Your Modem Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Cable the Modem Router with a Simple Network . . . . . . . . . . . . . . . . . .12
Cable Your Modem Router to a Router or Gateway . . . . . . . . . . . . . . . .12
Connect to the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Wired Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
WiFi Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Types of Logins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Log In to the Modem Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter 3 Specify Initial Settings
Notify Your Internet Service Provider. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Specify the Cable Connection Starting Frequency . . . . . . . . . . . . . . . . . . . . 21
View Modem Router Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Specify the Internet Connection Settings . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Chapter 4 Control Access to the Internet
Use Keywords to Block Internet Sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Block Services from the Internet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Schedule When to Block Internet Sites and Services . . . . . . . . . . . . . . . . .30
Avoid Blocking on a Trusted Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Set Up Security Event Email Notifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Chapter 5 Share a USB Drive Attached to the Modem Router
USB Drive Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Access a USB Drive on the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Control Access to the USB Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Use FTP Within the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
View or Change Network Folders on a USB Drive . . . . . . . . . . . . . . . . . . . .38
Add a Network Folder on a USB Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3
Edit a Network Folder on a USB Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Approve USB Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Safely Remove a USB Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Chapter 6 Specify Network Settings
View or Change the WAN Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Change the MTU Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Set Up a Default DMZ Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Change the Modem Router’s Device Name . . . . . . . . . . . . . . . . . . . . . . . . .49
Change the LAN TCP/IP Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Specify the IP Addresses That the Modem Router Assigns. . . . . . . . . . . . . 51
Reserve LAN IP Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Use the WPS Wizard for WiFi Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Specify Basic WiFi Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Change the WiFi Security Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Set Up a WiFi Guest Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Control the Wireless Radios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Use the WiFi On/Off Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Enable or Disable the Wireless Radios . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Specify WPS Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Set Up a Wireless Card Access List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Dynamic DNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Improve Network Connections with Universal Plug and Play . . . . . . . . . . . 65
Chapter 7 Manage Your Network
View Modem Router Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
View Cable Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
View Internet Port Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Wireless Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Reboot the Modem Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Change the Router Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
View Logs of Modem Router Activity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
View a Network Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Manage the Modem Router Configuration File . . . . . . . . . . . . . . . . . . . . . . 75
Back Up Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Restore Configuration Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Erase the Current Configuration Settings . . . . . . . . . . . . . . . . . . . . . . . . .76
Change the admin Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
View Event Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Run the Ping Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Run the Traceroute Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
View Wireless Access Points in Your Area . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
View or Change the Modem Router Wireless Channel . . . . . . . . . . . . . . . . 81
Remote Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
User Manual4
Chapter 8 Specify Internet Port Settings
Set Up Port Forwarding to a Local Server . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Add a Custom Port Forwarding Service . . . . . . . . . . . . . . . . . . . . . . . . . .87
Edit a Port Forwarding Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Delete a Port Forwarding Entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
Application Example: Make a Local Web Server Public . . . . . . . . . . . . .89
How the Modem Router Implements the Port Forwarding Rule . . . . . .90
Set Up Port Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Add a Port Triggering Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
Specify When to Use Port Triggering. . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
Application Example: Port Triggering for Internet Relay Chat . . . . . . .93
Chapter 9 Troubleshooting
Use LEDs to Troubleshoot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
Cannot Log In to the Modem Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Troubleshoot the ISP Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Troubleshoot a TCP/IP Network Using a Ping Utility . . . . . . . . . . . . . . . . . .97
Use PIng to Test the LAN Path to Your Gateway . . . . . . . . . . . . . . . . . . .99
Use Ping to Test the Path from a Windows PC to a Remote Device . . .99
Appendix A Supplemental Information
Factory Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103
User Manual5
1

1Hardware Setup

This chapter covers the following topics:
• Unpack Your Modem Router
• Front Panel
• Rear Panel
• Position Your Gateway
• Cable Your Modem Router
For more information about the topics covered in this manual, visit the support website at
http://support.netgear.com.
6
N600 WiFi Cable Modem Router Model C3700
Ethernet cable
Power adapterModem router

Unpack Your Modem Router

Your package contains the following items.
Figure 1. Package contents
Hardware Setup User Manual7
N600 WiFi Cable Modem Router Model C3700
Power LED
Downstream LED
Upstream LED
Internet LED
WPS button / LED
WiFi On/Off button
5 GHz LED
2.4 GHz LED
Ethernet LED
USB LED

Front Panel

The modem router has status LEDs and buttons on the front.
Hardware Setup User Manual8
Figure 2. Modem router front view
You can use the LEDs to verify status and connections. The following table lists and describes each LED and button on the front panel of the modem router.
LED Description
WPS button with LED
WiFi On/Off but­ton with LED
Power
Downstream
This button lets you use WPS to join the WiFi network without typing the WiFi password. The WPS LED blinks during this process and then lights solid.
Pressing this button for two seconds turns the WiFi radios in the modem router on and off. If this LED is lit, the WiFi radios are on. If this LED is off, the WiFi radios are turned off and you cannot use WiFi to connect to the modem router.
• Green. Power is supplied to the modem router.
• Off. No power is supplied to the modem router.
• Solid green. One or more downstream channels are locked.
• Blinking green. The
• Off. No down
unit is scanning for a downstream channel.
stream channel is locked.
N600 WiFi Cable Modem Router Model C3700
LED Description
Upstream
Internet
2.4 GHz radio
5 GHz radio
• Solid green. One or more upstream channels are locked.
• Blinking green. T
• Off.
• Solid green. The modem router is online.
• Blinking green. Th
• Off. T
• Green. The 2.4 GHz radio is on.
• Off. The 2.4 GHz radio is off.
• Green. The 5 GHz radio is on.
• Off. The 5 GHz radio is off.
No upstream channel is locked.
modem termination system (CMTS).
he modem router is offline.
he unit is scanning for an upstream channel.
e modem router is synchronizing with the cable provider’s cable
Ethernet
USB
• Green. A device is connected to an Ethernet port and powered on.
• Off. No device is connected to an Ethernet port.
• Green. A USB device is connected to the port on the back panel.
• Off. No USB device is connected to the port on the back panel.
Hardware Setup User Manual9
N600 WiFi Cable Modem Router Model C3700
Power adapter input
Ethernet LAN ports
Coaxial cable connector
Power On/Off button
USB port

Rear Panel

The rear panel has the connections and buttons shown the following figure.
Figure 3. Modem router rear panel

Position Your Gateway

The modem router lets you access your network anywhere within the operating range of your wireless network. However, the operating distance or range of your wireless connection can vary significantly depending on the physical placement of your modem router. For example, the thickness and number of walls the wireless signal passes through can limit the range.
Additionally, other wireless access points in and around your home might affect your modem
r’s signal. Wireless access points are modem routers, repeaters, WiFi range extenders,
route or any other device that emits a wireless signal for network access.
Position your modem router according to
Hardware Setup User Manual10
the following guidelines:
• Place your modem router near the center of the area where your computers and other devices operate, and within line of sight to your wireless devices.
• Make sure that the modem router is within reach of an AC power outlet and near Ethernet cables for wired computers.
• Place the modem router in an elevated location, minimizing the number walls and ceilings between the modem router and your other devices.
• Place the modem router away from electrical devices such as these:
- Ceiling fans
- Home security systems
- Microwaves
- Computers
- Base of a cordless phone
- 2.4 GHz cordless phone
• Place the modem router away from large metal surfaces, large glass surfaces, and
insulated walls such as these:
- Solid metal door
- Aluminum studs
- Fish tanks
- Mirrors
- Brick
- Concrete
• (Optional) If you have adjacent access points, use different radio frequency channels to
reduce interference.

Cable Your Modem Router

The most common way to cable your modem router is the simplest, without any other routers or gateways on the same network. You can also cable the modem router to another router or gateway and log in to the modem router to specify this setting.
Hardware Setup User Manual11
N600 WiFi Cable Modem Router Model C3700
Modem router
Power On/Off
Power adapter
Coaxial cable
button

Cable the Modem Router with a Simple Network

The modem router comes configured to work as both a modem and a router. You can share your Internet connection without connecting the modem router to a router or gateway.
Figure 4. Modem router simple network
To cable your modem router:
1. Connect a co
Use the coaxial cable that your cable company p modem router to a cable wall outlet or a line splitter.
Note: If Charte
2. Connect
electrical outlet.
3. Press the Power On
The Power LED lights green.
You can log in to the modem router to view or change
axial cable.
rovides to connect the cable port on the
r is your cable Internet service provider (ISP), Charter recommends connecting your modem router directly to a cable wall outlet. If you must use a splitter, use a splitter that is rated at 3.5 dBmv.
the power adapter to the modem router and plug the power adapter in to an
/Off button on the rear panel of the modem router.
its settings.

Cable Your Modem Router to a Router or Gateway

If you want to cable the modem router to a router or gateway, then you must log in to the modem router and change its Router Mode setting. Changing this setting prevents certain network conflicts that can occur when two devices on the same network perform routing
Hardware Setup User Manual12
N600 WiFi Cable Modem Router Model C3700
functions such as network address translation (NAT) and DHCP (assigning IP addresses to devices on the network).
To cable your modem router to a gateway or router:
1. Con
nect a coaxial cable.
Use the coaxial cable that your cable company provides to modem router to a cable wall outlet or a line splitter.
Note: I
f Charter is your cable Internet service provider (ISP), Charter recommends connecting your modem router directly to a cable wall outlet. If you must use a splitter, use a splitter that is rated at 3.5 dBmv.
2. Conn
ect the power adapter to the modem router and plug the power adapter in to an
electrical outlet.
3. Press the Power On/Off
button on the rear panel of the modem router.
The Power LED lights green.
4. On your
computer or wireless device, find and select the WiFi network.
The WiFi network name is on the modem router’s label.
in the WiFi network and enter the WiFi password.
5. Jo
The password is on the modem router’s label.
Your wireless device connects to the WiFi network.
6. Launch a web
browser.
connect the cable port on the
ype http://routerlogin.net or http://192.168.0.1.
7. T
A login screen displays.
8. Ente
r the modem router user name and password.
The user name is adm
in. The default password is password. The user name and
password are case-sensitive.
The BASIC Home screen displays.
9. Select AD
10. Select th
VANCED > Administration > Router Mode.
e No radio button.
With this setting, the modem router works as a bridge and obtains IP addresses from the Internet service provider.
11. Click the Ap
ply button.
Hardware Setup User Manual13
Your change is saved.
12. Follow the instructions that came with your router to connect it to the modem router.
Hardware Setup User Manual14
2
2Connect to the Network and
Access the Modem Router
This chapter contains the following sections:
• Connect to the Network
• Types of Logins
• Log In to the Modem Router
15

Connect to the Network

You can connect to the modem router’s network through a wired or WiFi connection. If you set up your computer to use a static IP address, change the settings so that it uses Dynamic Host Configuration Protocol (DHCP).

Wired Connection

You can connect your computer to the modem router using an Ethernet cable and join the modem router’s local area network (LAN).
To connect your computer to the modem router with an Ethernet cable:
1. Make sure that the modem router has power (its Power LED is lit).
2. Connect an Ethernet cable to an Ethernet port on your computer.
3. Connect the other end of the Ethernet cable to one of the numbered Ethernet ports.
Your computer connects to the local area network (LAN). A message might display on your computer screen to notify you that an Ethernet cable is connected.

WiFi Connection

You can connect to the modem router’s WiFi network with Wi-Fi Protected Setup (WPS) or you can find and select the WiFi network.
To use WPS to connect to the WiFi network:
1. Make sure that the modem router has power (its Power LED is lit).
2. Check the WPS instructions for your computer or wireless device.
3. Press the WPS button on the modem router.
4. Within two minutes, on your computer or WiFi device, press its WPS button or follow its
instructions for WPS connections.
Your computer or wireless device connects to the WiFi network.
To find and select the WiFi network:
1. Make sure that the modem router has power (its Power LED is lit).
2. On your computer or wireless device, find and select the WiFi network.
The WiFi network name is on the modem router’s label.
3. Join the WiFi network and enter the WiFi password.
The password is on the modem router’s label.
Your wireless device connects to the WiFi network.
Connect to the Network and Access the Modem Router
User Manual16
N600 WiFi Cable Modem Router Model C3700

Label

The label on the modem router shows the login information, MAC address, and serial number.
Figure 5. Modem router label

Types of Logins

Separate types of logins have different purposes. It is important that you understand the difference so that you know which login to use when.
Types of logins:
• ISP login. The service provider gave you this login information in a letter or some other way. If you cannot find this login information, contact your service provider.
• WiFi network key or password. Y network name (SSID) and password for wireless access. This information is on the modem router label.
• Modem router login.This logs you in to as admin.
login that your ISP gave you logs you in to your Internet service. Your
our modem router is preset with a unique wireless
the modem router interface from a web browser

Log In to the Modem Router

When you connect to the network (either with WiFi or with an Ethernet cable), you can use a web browser to access the modem router to view or change its settings. The first time you access the modem router, NETGEAR genie automatically checks to see if your modem router can connect to your Internet service.
Connect to the Network and Access the Modem Router
User Manual17
To log in to the modem router:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
Connect to the Network and Access the Modem Router
User Manual18
3

3Specify Initial Settings

This chapter contains the following sections:
• Notify Your Internet Service Provider
• Specify the Cable Connection Starting Frequency
• View Modem Router Initialization
• Specify the Internet Connection Settings
19
N600 WiFi Cable Modem Router Model C3700

Notify Your Internet Service Provider

You must contact your Internet service provider (ISP) and tell them that you are using the modem router.
To set up your Internet connection:
1. Cont
act your cable ISP and inform them that you are installing a new modem router that
you bought from a retail store.
Provide your cable ISP with the modem r
outer’s model number, which is C3700.
Note: The modem router is certified by all major cable ISPs.
You can also visit your cable ISP’s website and follow the onscreen instructions to set up your Internet service.
Table 1.
Cable ISP Contact Information
Cox
Mediacom
Optimum
https://www.cox.com/residential/support/home.html https://www.cox.com/activate
1-888-556-1193
https://support.mediacomcable.com
1-855-Mediacom (1-855-633-4226)
https://www.optimum.net/support/contact-us https://install.optimum.com/JointInstall
1-877-810-6750
Sparklight
Spectrum
Xfinity
https://support.sparklight.com
1-877-692-2253
https://www.spectrum.net/contact-us https://activate.spectrum.net
1-833-267-6094
https://www.xfinity.com/internetsetup Use the Xfinity app for Xfinity activation.
Note: The contact information listed might change. You can also find the
contact number in your monthly Internet service billing statement.
2. When asked, provide the modem router’s serial number and MAC address on the product label.
Specify Initial Settings User Manual20
3. Wait for your cable ISP to confirm that your modem router is active.
4. If you do not have an Internet connection with the modem router, ask your cable ISP to look
for your modem router online, and do one of the following depending on what your cable ISP tells you about your modem router:
• If the modem router is not visible, your cable ISP can give you instructions to verify
why the modem router does not connect with your high-speed Internet service.
• If the modem router is visible to your cable ISP, reboot the computer, laptop, or home
gateway that is connected to the modem router. Try checking your online status again.

Specify the Cable Connection Starting Frequency

The starting frequency is automatically generated. For most Internet connections, you do not need to specify this information. If you need to enter a starting frequency, contact your Internet service provider.
To change the starting frequency:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
Specify Initial Settings User Manual21
N600 WiFi Cable Modem Router Model C3700
4. Select Cable Connection.
5. Enter an number in the Starting Frequency field.
6. Click the Appl
y button.

View Modem Router Initialization

You can track the initialization procedure of the modem router, and get details about the downstream and upstream cable channel. The time is displayed after the modem router is initialized.
The modem router automatically goes through the fo process:
• Scan
• Ob
• Connect
To view the status of the modem router initialization:
1. Laun
2. Ty
s and locks the downstream frequency and then ranges the upstream channels.
tains a WAN address for the modem router.
s to the Internet.
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
llowing steps in the provisioning
3. Enter
Specify Initial Settings User Manual22
the modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
min. The default password is password. The user name and
N600 WiFi Cable Modem Router Model C3700
4. Select Cable Connection.
The Startup Procedure section displays the initialization progress.
The Downstream Bonded Channels section displays the st
atus of each channel.
Specify Initial Settings User Manual23
N600 WiFi Cable Modem Router Model C3700

Specify the Internet Connection Settings

You can view or change the modem router’s Internet connection settings.
To specify the Internet connection settings:
1. Laun
2. Ty
3. Enter
4. Select A
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
the modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
DVANCED > Setup > Internet Setup.
min. The default password is password. The user name and
5. If your Internet connection requires an account name or host name, type it in the Account Name (If Required) field.
your Internet connection requires a domain name, type it in the Domain Name (If
6. If Required) field.
For the other sections in this screen, the def change them.
7. Fo
Specify Initial Settings User Manual24
r the Internet IP Address setting, select one of the following radio buttons:
• Get Dynamically from ISP. Y
automatically assigns these addresses.
our ISP uses DHCP to assign your IP address. Your ISP
ault settings usually work, but you can
• Use Static IP Address. Enter the IP address, IP subnet mask, and the gateway IP
address that your ISP assigned. The gateway is the ISP modem router to which your modem router connects.
8. For the Domain Name Server (DNS) Address setting, select one of the following radio buttons:
• Get Automatically from ISP. Your ISP uses DHCP to assign your DNS servers. Your
ISP automatically assigns this address.
• Use These DNS Servers. If you know that your ISP requires specific servers, select
this option. Enter the IP address of your ISP’s primary DNS server. If a secondary DNS server address is available, enter it also.
9. Click the Apply button.
Your settings are saved.
Note: If you get address not found errors when you go to a website, it is
likely that your DNS servers are not set up correctly. Contact your ISP to get the DNS server addresses.
Specify Initial Settings User Manual25
4

4Control Access to the Internet

This chapter explains how to prevent objectionable content from reaching the computers and other devices that are connected to your network.
This chapter includes the following sections:
• Use Keywords to Block Internet Sites
• Block Services from the Internet
• Schedule When to Block Internet Sites and Services
• Avoid Blocking on a Trusted Computer
• Set Up Security Event Email Notifications

Use Keywords to Block Internet Sites

You can use keywords to block certain Internet sites from your network. You can use blocking all the time or based on a schedule.
To block Internet sites:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
26
N600 WiFi Cable Modem Router Model C3700
4. Select ADVANCED > Security > Block Sites.
5. Select one of the keyword blocking options:
• Per Schedule. T
Schedule When to Block Internet Sites and Services on page 30.)
(See
• Always.
Turn on keyword blocking all the time, independent of the Schedule screen.
urn on keyword blocking according to the Schedule screen settings.
6. In the Keyword
field, enter a keyword or domain that you want to block.
For example:
pecify XXX to block http://www.badstuff.com/xxx.html.
• S
• S
pecify .com if you want to allow only sites with domain suffixes such as .edu or .gov.
• Ent
7. Click the Ad
The keyword is added to the keyword list. The keyword list suppo
8. Click the Ap
er a period (.) to block all Internet browsing access.
d Keyword button.
rts up to 32 entries.
ply button.
Keyword blocking takes effect.
To delete keywords from the list:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Ente
r the modem router user name and password.
The user name is adm
in. The default password is password. The user name and
password are case-sensitive.
The BASIC Home screen displays.
Control Access to the Internet User Manual27
N600 WiFi Cable Modem Router Model C3700
4. Select ADVANCED > Security > Block Sites.
5. Do one of the following:
• T
o delete a single word, select it and click the Delete Keyword button.
The keyword is removed from the list.
• To delete all keywords on the list, click the Clear List button.
All keywords are removed from the list.
6. Click the
Your changes are saved.
Apply button.

Block Services from the Internet

You can block Internet services on your network based on the type of service. You can block the services all the time or based on a schedule.
To block services:
1. Laun
2. Ty
3. Enter
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
the modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
min. The default password is password. The user name and
4. Select ADV
5. Specify when to block the services:
• T
o block the services all the time, select the Always radio button.
• T
o block the services based on a schedule, select the Per Schedule radio button.
Control Access to the Internet User Manual28
ANCED > Security > Block Services.
N600 WiFi Cable Modem Router Model C3700
To specify the schedule, see Schedule When to Block Internet Sites and Services on page 30.
6. Click the Ad
d button.
7. To add a service that is in the Service Type list, select the application or service.
The settings for this service automatically display in the fields.
o add a service or application that is not the list, select User Defined.
8. T
f you know that the application uses either TCP or UDP, select the appropriate
a. I
protocol; otherwise, select TCP/UDP (both).
b. Ent
er the starting port and ending port numbers:
• I
f the service uses a single port number, enter that number in both fields.
• T
o find out which port numbers the service or application uses, you can contact the publisher of the application, ask user groups or newsgroups, or search on the Internet.
9. T
o specify how to filter the services, select one of the following radio buttons:
• Only This IP Address.
• IP Address Range.
Block services for a single computer.
Block services for a range of computers with consecutive IP
addresses on your network.
• All lP Addresses. Block se
10. Click the Ad
d button.
rvices for all computers on your network.
Your changes are saved.
Control Access to the Internet User Manual29

Schedule When to Block Internet Sites and Services

When you schedule blocking, the same schedule is used to block sites and to block services. For information about how to specify what you want the modem router to block, see
Keywords to Block Internet Sites on page 26 and Block Services from the Internet on page 28.
To schedule blocking:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
Use
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Security > Schedule.
5. Specify when to block keywords and services:
• Days to Block. Select the check box for each day that you want to block the
keywords or select the Every Day check box, which automatically selects the check boxes for all days.
• Time of Day to Block. Select a start and end time in 24-hour format, or select All Day for 24-hour blocking.
6. Select your time zone from the list.
7. If you use daylight saving time, select the Automatically adjust for daylight savings time
check box.
8. Click the Apply button.
Your settings are saved.

Avoid Blocking on a Trusted Computer

You can exempt one trusted computer from blocking. The computer you exempt must have a fixed IP address. You can use the reserved IP address feature to specify the IP address. See Reserve LAN IP Addresses on page 52.
Control Access to the Internet User Manual30
N600 WiFi Cable Modem Router Model C3700
To specify a trusted computer:
1. L
aunch a web browser from a computer or wireless device that is connected to the
network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Ente
4. Select AD
5. Scroll down and select the Allow trusted
6. In the Trusted IP Address field, enter the IP address of the trusted computer.
7. Click the Ap
r the modem router user name and password.
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
VANCED > Security > Block Sites.
ply button.
Your changes are saved.
in. The default password is password. The user name and
IP address to visit blocked sites check box.

Set Up Security Event Email Notifications

The modem router can email you its logs. The log records modem router activity and security
events such as attempts to access blocked sites or services.
To set up email notifications:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Ente
Control Access to the Internet User Manual31
r the modem router user name and password.
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
in. The default password is password. The user name and
N600 WiFi Cable Modem Router Model C3700
4. Select ADVANCED > Security > E-mail.
5. Select the Turn E-mail Notification On check box.
6. In
the Your Outgoing Mail Server field, enter the name of your ISP outgoing (SMTP) mail
server (such as mail.myISP.com).
You might be able to find this information in th
e configuration screen of your email
program. If you leave this field blank, log and alert messages are not sent.
7. Enter th
e email address to which logs and alerts are sent in the Send to This E-mail
Address field.
This email address is also used for the From address. If
this field is blank, log and alert
messages are not sent.
8. If
your outgoing email server requires authentication, select the My Mail Server requires
authentication check box.
a. In the
b. In the Password field,
o send alerts when someone attempts to visit a blocked site, select the Send Alerts
9. T
User Name field, type the user name for the outgoing email server.
type the password for the outgoing email server.
Immediately check box.
10. T
o send logs based on a schedule, specify these settings:
• From Send logs
according to this schedule drop-down list, select the schedule
type.
• From the Day
• From the Ti
11. Click the Appl
drop-down list, select the day.
me drop-down list, select the time, and select the am or pm radio button.
y button.
Your settings are saved.
Logs are sent automatically. If the log fills up before the specifie log is sent, it is cleared from the modem router memory. If the modem router cannot email the log and the log buffer fills up, the modem router overwrites the log.
Control Access to the Internet User Manual32
d time, it is sent. After the
5
5Share a USB Drive Attached to the
Modem Router
This chapter describes how to access and configure a USB storage drive attached to your modem router. The USB port on the modem router can be used only to connect USB storage devices like flash drives or hard drives, or a printer. Do not connect computers, USB modems, CD drives, or DVD drives to the modem router USB port.
This chapter contains the following sections:
• USB Drive Requirements
• Access a USB Drive on the Network
• Control Access to the USB Drive
• Use FTP Within the Network
• View or Change Network Folders on a USB Drive
• Add a Network Folder on a USB Drive
• Edit a Network Folder on a USB Drive
• Approve USB Devices
• Safely Remove a USB Drive
For more information about ReadySHARE features, visit www.netgear.com/readyshare.
33

USB Drive Requirements

The modem router works with most USB-compliant external flash and hard drives. For the most up-to-date list of USB drives that the modem router supports, visit http://kbserver.netgear.com/readyshare.
Some USB external hard drives and flash drives require you to load the drivers onto the computer before the computer can access the USB device. Such USB devices do not work with the modem router.
The modem router supports the following file system types for full read/write access:
• FAT16, FAT32
• NTFS
• NTFS with compression format enabled
• Ext2, Ext3, Ext4
• XFS
• HFS
• HFS+

Access a USB Drive on the Network

ReadySHARE lets you access and share a USB drive connected to the modem router USB port. (If your USB drive has special drivers, it is not compatible.)
To connect a USB drive:
1. Insert your USB storage drive into the USB port on the rear panel of the modem router.
2. If your USB drive has a power supply, you must use it when you connect the USB drive to
the modem router.
When you connect the USB drive to the modem router USB port, it might take up to two minutes before it is ready for sharing. By default, the USB drive is available to all computers on your local area network (LAN).
To access the USB drive from a Mac:
1. Select Go > Connect to Server.
2. Enter smb://readyshare as the server address.
3. Click the Connect button.
To access the USB drive from a Windows computer:
1. Select Start > Run.
Share a USB Drive Attached to the Modem Router
User Manual34
N600 WiFi Cable Modem Router Model C3700
2. Enter \\readyshare in the dialog box and click the OK button.
To map the USB device to a Windows network drive:
sit www.netgear.com/readyshare.
1. Vi
2. In the ReadySHARE USB Storage Access pane, click PC Utility.
The read
3. Launch read
4. Select the drive letter to map to the network folder.
5. (Optional) using different credentials check box.
a. T
b. Click the OK b
6. Click the Fini
yshareconnect.exe file is downloaded to your computer.
yshareconnect.exe.
If you want to connect to the USB drive as a different user, select the Connect
ype the user name and password.
utton.
sh button.
The USB drive is mapped to the drive letter that you specified.

Control Access to the USB Drive

You can specify the device name, workgroups, and network folders for your USB device.
To specify the USB access settings:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Ente
Share a USB Drive Attached to the Modem Router
r the modem router user name and password.
User Manual35
N600 WiFi Cable Modem Router Model C3700
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select A
DVANCED > USB Storage > Advanced Settings.
5. Specify access to the USB storage device:
• Network Device Name. This is the n
to the modem router. The default is readyshare.
• Workgroup. If yo
u are using a Windows workgroup rather than a domain, the workgroup name is displayed here. The name works only in an operating system that supports NetBIOS, such as Microsoft Windows.
• Access Method. Select the
check boxes for the access methods that you want:
- Network Neighborhood/MacShare. Enabled by default.
ame used to access the USB device connected
- HTTP.
Enabled by default. You can type
http://readyshare.routerlogin.net/shares to access the USB drive.
- HTTP (via Internet).
can type http://<public IP address/shares> (for example, http://1.1.10.102/shares) or a URL domain name to access the USB drive over the Internet. This feature supports file uploading only.
- FTP. Disab
led by default.
- FTP (via Internet). Disabled by
can access the USB drive through FTP over the Internet. This feature supports both downloading and uploading of files.
you changed the settings, click the Apply button.
6. If
Your changes are saved.
Share a USB Drive Attached to the Modem Router
Disabled by default. If you enable this feature, remote users
default. If you select this check box, remote users
User Manual36
N600 WiFi Cable Modem Router Model C3700

Use FTP Within the Network

File Transfer Protocol (FTP) lets you send and receive large files faster.
To set up FTP access:
1. L
aunch a web browser from a computer or wireless device that is connected to the
network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Ente
4. Select AD
r the modem router user name and password.
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
VANCED > USB Storage > Advanced Settings.
in. The default password is password. The user name and
5. Select the FTP check box.
6. Click the Ap
Your changes are saved.
Share a USB Drive Attached to the Modem Router
ply button.
User Manual37
N600 WiFi Cable Modem Router Model C3700

View or Change Network Folders on a USB Drive

You can view or change the network folders on the USB storage device
To view or change network folders:
1. Laun
2. Ty
3. Enter
4. Select A
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
the modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
DVANCED > USB Storage > Advanced Settings.
min. The default password is password. The user name and
5. Scroll down to the Available Networks Folder section of the screen, and adjust the following
settings:
• Share Name. USB_Storage. (Some modem router models have more than one USB port.)
You can click the name or type it in the addre Shared is shown, the default share has been deleted, and no other share for the root folder exists. Click the link to change this setting.
• Read Access and Write Access. Show the network folder. All – no password (the default) allows all users to access the network
Share a USB Drive Attached to the Modem Router
If only one device is connected, the default share name is
ss field of your web browser. If Not
permissions and access controls on the
User Manual38
N600 WiFi Cable Modem Router Model C3700
folder. The password for admin is the same one that you use to log in to the modem router.
• Folder Name.
Full path of the network folder.
• Volume Name. V
• Total Space and Free Space. Sh
olume name from the storage device (either USB drive or HDD).
ow the current utilization of the storage device.

Add a Network Folder on a USB Drive

You can add network folders on the USB storage device.
To add a network folder:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Ente
4. Select AD
r the modem router user name and password.
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
VANCED > ReadySHARE.
in. The default password is password. The user name and
5. Click the Edi
6. Click the Create
If this screen does not display, your web browser might be blocking pop-ups. If it is, change the browser settings to allow pop-ups.
7. In the USB Device li
8. Click the Br
9. In the Sh
10. In the Re
t button.
Network Folder button.
st, select the USB drive.
owse button and in the Folder field, select the folder.
are Name field, type the name of the share.
ad Access list and the Write Access list, select the settings that you want.
Share a USB Drive Attached to the Modem Router
User Manual39
The user name (account name) for All – no password is guest. The password for admin is the same one that is used to log in to the modem router. By default, it is password.
11. Click the Apply button.
The folder is added on the USB device.
Share a USB Drive Attached to the Modem Router
User Manual40

Edit a Network Folder on a USB Drive

You can add network folders on the USB storage device.
To edit a network folder:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > ReadySHARE.
5. Click the Edit button.
The Edit Network Folder screen displays the same settings shown in the Create Network Folder screen.
6. Change the settings in the fields as needed.
7. Click the Apply button.
Your changes are saved.

Approve USB Devices

For more security, you can set up the modem router to share only USB devices that you approve.
To approve USB devices:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
Share a USB Drive Attached to the Modem Router
User Manual41
N600 WiFi Cable Modem Router Model C3700
4. Select ADVANCED > Advanced Setup > USB Settings.
By default Enable any USB Device connection to the USB port radio is selected. This setting lets you connect and access all your USB drives.
5. Select the No radio
6. Click the Approved Devices butto
button.
n.
The approved and available USB devices display.
7. In the Available USB Devices list, select the drive that you want to approve.
8. Click the Add but
9. Select the Allow only
10. Click the Appl
ton.
approved devices check box.
y button.
Your change takes effect.
o work with another USB device, first click the Safely Remove USB Device button for the
11. T currently connected USB device. Connect the other USB device, and repeat this process.
Share a USB Drive Attached to the Modem Router
User Manual42

Safely Remove a USB Drive

Before you physically disconnect a USB drive from the modem router USB port, log in to the modem router and take the drive offline.
To remove a USB disk drive safely:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select USB Storage > Basic Settings.
5. Click the Safely Remove USB Device button.
This takes the drive offline.
6. Physically disconnect the USB drive.
Share a USB Drive Attached to the Modem Router
User Manual43
6

6Specify Network Settings

This chapter includes the following sections:
• View or Change the WAN Settings
• Change the MTU Size
• Set Up a Default DMZ Server
• Change the Modem Router’s Device Name
• Change the LAN TCP/IP Settings
• Specify the IP Addresses That the Modem Router Assigns
• Reserve LAN IP Addresses
• Use the WPS Wizard for WiFi Connections
• Specify Basic WiFi Settings
• Change the WiFi Security Option
• Set Up a WiFi Guest Network
• Control the Wireless Radios
• Specify WPS Settings
• Set Up a Wireless Card Access List
• Dynamic DNS
• Improve Network Connections with Universal Plug and Play
44
N600 WiFi Cable Modem Router Model C3700

View or Change the WAN Settings

You can view the wide area network (WAN) settings for the Internet port. You can set up a DMZ (demilitarized zone) server, change the maximum transmit unit (MTU) size, and enable the modem router to respond to a ping to its WAN (Internet) port.
To view or change the WAN settings:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Ente
4. Select ADVANCED > Setup > WAN Setup
5. V
r the modem router user name and password.
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
iew or change the following settings:
• Disable IPv4 Firewall Protection.
the recommended setting. Some advanced users might want to disable IPv4 firewall protection to examine the traffic coming in from the Internet.
• Disable Port Scan and DoS Protection.
denial of service attacks such as Syn flood, Smurf Attack, Ping of Death, and many others. Select this check box only in special circumstances.
• Default DMZ Server.
games or videoconferencing, but it makes the firewall security less effective. See Up a Default DMZ Server on page 48.
in. The default password is password. The user name and
The IPv4 firewall is enabled by default, which is
This feature is sometimes helpful when you are playing online
.
DoS protection protects your LAN against
Set
• Respond to Ping on Internet Port.
discovered. Use this feature only as a diagnostic tool or if you have a specific reason.
• MTU Size (in bytes). The n
Ethernet networks is 1500 bytes, or 1492 bytes for PPPoE connections. Change the
Specify Network Settings User Manual45
ormal MTU (maximum transmit unit) value for most
This feature allows your modem router to be
MTU only if you are sure that it is necessary for your ISP connection. See Change the MTU Size on page 46.
• Disable SIP ALG. Some VoIP applications do not work well with the SIP ALG.
Selecting this check box to turn off the SIP ALG might help your VoIP devices to create or accept a call through the modem router.
6. Click the Apply button.
Your changes are saved.

Change the MTU Size

The maximum transmission unit (MTU) is the largest data packet a network device transmits. When one network device communicates across the Internet with another, the data packets travel through many devices along the way. If a device in the data path has a lower MTU setting than the other devices, the data packets must be split or “fragmented” to accommodate the device with the smallest MTU.
The best MTU setting for NETGEAR equipment is often the default value. In some situations, changing the value fixes one problem but causes another. Leave the MTU unchanged unless one of these situations occurs:
• You experience problems connecting to your ISP or other Internet service, and the technical support of either the ISP or NETGEAR recommends changing the MTU setting. These web-based applications might require an MTU change:
- A secure website that does not open, or displays only part of a web page
- Yahoo email
- MSN portal
- America Online’s DSL service
• You use VPN and have severe performance problems.
• You used a program to optimize MTU for performance reasons, and now you have
connectivity or performance problems.
Note: An incorrect MTU setting can cause Internet communication
problems. For example, you might not be able to access certain websites, frames within websites, secure login pages, or FTP or POP servers.
To change the MTU size:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
Specify Network Settings User Manual46
N600 WiFi Cable Modem Router Model C3700
A login screen displays.
3. Ente
r the modem router user name and password.
The user name is adm
in. The default password is password. The user name and
password are case-sensitive.
The BASIC Home screen displays.
4. Select AD
VANCED > Setup > WAN Setup.
5. In the MTU Size field, enter a value from 64 to 1500.
6. Click the Ap
ply button.
Your change is saved.
If you suspect an MTU problem, a common solution is to change the MTU to 1400. If you are willing to e
xperiment, you can gradually reduce the MTU from the maximum value of 1500 until the problem goes away. The following table describes common MTU sizes and applications.
Table 2. Common MTU sizes
MTU Application
1500 The largest Ethernet packet size. This setting is typical for connections that do not use
1492 Used in PPPoE environments.
1472 Maximum size to use for pinging. (Large
1468 Used in some DHCP environments.
1460 Usable by AOL if you do not have large email attachments, for example.
1436 Used in PPTP environments or with VPN.
1400 Maximum size for AOL DSL.
576 Typical value to connect to dial-up ISPs.
PPPoE or VPN, and is the default value for NETGEAR modem routers, adapters, and switches.
r packets are fragmented.)
Specify Network Settings User Manual47
WARNING:

Set Up a Default DMZ Server

The default DMZ server feature is helpful when you are using some online games and videoconferencing applications that are incompatible with Network Address Translation (NAT). The modem router is programmed to recognize some of these applications and to work correctly with them, but other applications might not function well. In some cases, one local computer can run the application correctly if the IP address for that computer is entered as the default DMZ server.
DMZ servers pose a security risk. A computer designated as the default DMZ server loses much of the protection of the firewall and is exposed to exploits from the Internet. If compromised, the DMZ server computer can be used to attack other computers on your network.
The modem router usually detects and discards incoming traffic from the Internet that is not a response to one of your local computers or a service that you have configured in the Port Forwarding/Port Triggering screen. Instead of discarding this traffic, you can have the modem router forward the traffic to one computer on your network. This computer is called the default DMZ server.
To set up a default DMZ server:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Setup > WAN Setup.
5. Select the Default DMZ Server check box.
6. Type the IP address.
7. Click the Apply button.
Your change takes effect.
Specify Network Settings User Manual48
N600 WiFi Cable Modem Router Model C3700

Change the Modem Router’s Device Name

The modem router’s device name is C3700. This device name displays in file manager when you browse your network.
To change the modem router’s device name:
aunch a web browser from a computer or wireless device that is connected to the
1. L
network.
ype http://routerlogin.net or http://192.168.0.1.
2. T
A login screen displays.
3. Ente
4. Select AD
r the modem router user name and password.
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
VANCED > Setup > LAN Setup.
in. The default password is password. The user name and
5. In the Device Name field, type a new name.
6. Click the Ap
Your change is saved.
ply button.

Change the LAN TCP/IP Settings

The modem router is preconfigured to use private IP addresses on the LAN side and to act as a DHCP server. The modem router’s default LAN IP configuration is as follows:
Specify Network Settings User Manual49
N600 WiFi Cable Modem Router Model C3700
• LAN IP address. 192.168.0.1
• Subnet mask. 2
55.255.255.0
These addresses are part of the designated private address range for use in private networks and a
re suitable for most applications. If your network requires a different IP addressing
scheme, you can change these settings
You might want to change these settings if you n
eed a specific IP subnet that one or more
devices on the network uses, or if you have competing subnets with the same IP scheme.
To change the LAN TCP/IP settings:
1. Laun
ch a web browser from a computer or wireless device that is connected to the
network.
2. Ty
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter
the modem router user name and password.
The user name is ad
min. The default password is password. The user name and
password are case-sensitive.
The BASIC Home screen displays.
4. Select A
DVANCED > Setup > LAN Setup.
5. In the IP Address field, type the IP address.
6. In
the IP Subnet Mask field type the subnet mask of the modem router.
The IP address and subnet mask identify which add and which must be reached through a gateway or modem router.
7. Click the Appl
y button.
Your changes are saved.
Specify Network Settings User Manual50
resses are local to a specific device
If you changed the LAN IP address of the modem router, you are disconnected when this change takes effect.
To reconnect, close your browser, relaunch it, and log in to the modem router.

Specify the IP Addresses That the Modem Router Assigns

By default, the modem router acts as a Dynamic Host Configuration Protocol (DHCP) server. The modem router assigns IP, DNS server, and default gateway addresses to all computers connected to the LAN. The assigned default gateway address is the LAN address of the modem router.
These addresses must be part of the same IP address subnet as the modem router’s LAN IP address. Using the default addressing scheme, define a range between 192.168.0.2 and
192.168.0.254, although you can save part of the range for devices with fixed addresses.
To specify the pool of IP addresses that the modem router assigns:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
Specify Network Settings User Manual51
N600 WiFi Cable Modem Router Model C3700
4. Select ADVANCED > Setup > LAN Setup.
5. Specify the range of IP addresses that the modem router assigns:
a. In the S
tarting IP Address field, type the lowest number in the range.
This IP address must be in the same subnet as the modem router.
b. In the Endi
addresses.
This IP address must be in the same subnet as the modem router.
6. Click the Appl
Your settings are saved.
The modem router delivers the following p
• An IP add
• Subnet
• Ga
• DNS serve
mask
teway IP address (the modem router’s LAN IP address)
ng IP Address field, type the number at the end of the range of IP
y button.
arameters to any LAN device that requests DHCP:
ress from the range that you have defined
r IP address (the modem router’s LAN IP address)

Reserve LAN IP Addresses

When you specify a reserved IP address for a computer on the LAN, that computer always receives the same IP address each time it accesses the modem router’s DHCP server. Assign reserved IP addresses to computers or servers that require permanent IP settings.
To reserve an IP address:
1. Laun
Specify Network Settings User Manual52
ch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Setup > LAN Setup.
5. In the Address Reservation section of the screen, click the Add button.
6. In the IP Address field, type the IP address to assign to the computer or server.
Choose an IP address from the modem router’s LAN subnet, such as 192.168.0.x.
7. Type the MAC address of the computer or server.
Tip: If the computer is already on your network, you can copy its MAC
address from the Attached Devices screen and paste it here.
8. Click the Apply button.
The reserved address is entered into the table.
The reserved address is not assigned until the next time the computer contacts the modem router’s DHCP server. Reboot the computer, or access its IP configuration and force a DHCP release and renew.
To edit a reserved address entry:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Setup > LAN Setup.
5. Select the radio button next to the reserved address.
6. Click the Edit button.
7. Change the settings.
8. Click the Apply button.
Your changes are saved.
Specify Network Settings User Manual53
To delete a reserved address entry:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Setup > LAN Setup.
5. Select the radio button next to the reserved address.
6. Click the Delete button.
The address is removed.

Use the WPS Wizard for WiFi Connections

The WPS Wizard helps you add a wireless computer or device to your WiFi network without typing the WiFi password.
To use the WPS Wizard:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > WPS Wizard.
5. Click the Next button.
6. Select the radio button for the setup method that you want to use:.
• Push button. Click the WPS button on this screen.
• PIN Number. The screen adjusts. Enter the client security PIN, and click the Next
button.
7. Within two minutes, go to the client device and use its WPS software to connect to the WiFi network.
Specify Network Settings User Manual54
The WPS process automatically sets up your wireless computer with the network password when it connects. The modem router WPS screen displays a confirmation message.

Specify Basic WiFi Settings

The modem router comes with preset security. This means that the WiFi network name (SSID), network key (password), and security option (encryption protocol) are preset in the factory. You can find the preset SSID and password on the modem router label. The preset SSID and password are uniquely generated for every device to maximize your wireless security.
NETGEAR recommends that you do not change your preset security settings. If you change your preset security settings, make a note of the new settings and store it in a safe place where you can easily find it.
If you use a wireless computer to change the wireless network name (SSID) or other wireless security settings, you are disconnected when you click the Apply button. To avoid this problem, use a computer with a wired connection to access the modem router.
To specify basic wireless settings:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
Specify Network Settings User Manual55
N600 WiFi Cable Modem Router Model C3700
4. Select Wireless.
5. In the Region list, select your region. In some locations, you cannot change this setting.
6. T
o turn off the wireless radios, scroll down and clear the Enable Wireless Gateway radio
check box.
If you clear this check box, you cannot
o control the SSID broadcast, select or clear the Enable SSID Broadcast check box.
7. T
When this check box is selected, the modem route
use WiFi to connect to the modem router.
r broadcasts its network name (SSID) so that it displays when you scan for local WiFi networks on your computer or wireless device.
8. T
o change the network name (SSID), type a new name in the Name (SSID) field.
The name can be up to 32 characters long and it is case-se
nsitive. The default SSID is randomly generated and is on the modem router’s label. If you change the name, make sure to write down the new name and keep it in a safe place.
o change the wireless channel, select a number in the Channel list.
9. T
In some regions, not all channels are available. Do not change the channel unless you exp
erience interference (shown by lost connections or slow data transfers). If this
happens, experiment with different channels to see which is the best.
When you use multiple access points, it is better if adjace
nt access points use different channels to reduce interference. The recommended channel spacing between adjacent access points is four channels (for example, use Channels 1 and 5, or 6 and 10).
o change the mode, select it from the Mode list.
10. T
Up to 145 Mbps is the de
fault setting, which allows 802.11n and 802.11g wireless
devices to join the network. g & b supports up to 54 Mbps. The 300-Mbps setting allows
802.11n devices to connect at this speed.
11. Click the Appl
Specify Network Settings User Manual56
y button.
Your settings are saved.
If you connected wirelessly to the network and you changed the SSID, you are disconnected from the network.
12. Make sure that you can connect wirelessly to the network with its new settings.
If you cannot connect wirelessly, check the following:
• Is your computer or wireless device connected to another wireless network in your
area? Some wireless devices automatically connect to the first open network without wireless security that they discover.
• Is your computer or wireless device trying to connect to your network with its old
settings (before you changed the settings)? If so, update the wireless network selection in your computer or wireless device to match the current settings for your network.

Change the WiFi Security Option

Your modem router comes with preset WPA2 or WPA security. The password that you enter to connect to your network is unique to your modem router and is on the modem router label.
NETGEAR recommends that you use the preset security, but you can change them. NETGEAR recommends that you do not disable security.
To change the WPA settings:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select Wireless.
5. Under Security Options, select a radio button for one of the following WPA options:
• WPA2-PSK [AES]
• WPA-PSK [TKIP}] + WPA2-PSK [AES]
The WPA2 options use the newest standard for the strongest security, but some older computers and wireless devices cannot use WPA2. By default, the WPA-PSK [TKIP] + WPA2-PSK [AES] radio button is selected so that new or old computers and wireless devices can connect to the WiFi network by using either WPA2 or WPA security.
The Passphrase field displays.
Specify Network Settings User Manual57
N600 WiFi Cable Modem Router Model C3700
6. In the Passphrase field, enter the network key (password) that you want to use.
It is a text string from 8 to 63 characters.
rite down the new password and keep it in a secure place for future reference.
7. W
8. Click the Appl
Your changes are saved.
y button.

Set Up a WiFi Guest Network

A guest network allows visitors at your home to use the Internet without using your wireless security key. You can add a guest network to each wireless network: 2.4 GHz b/g/n and
5.0 GHz a/n.
To set up a guest network:
1. Laun
2. Ty
3. Enter
4. Select Guest Network.
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
the modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
min. The default password is password. The user name and
5. Select any of the following wireless settings:
Specify Network Settings User Manual58
• Enable Guest Network. When this check box is selected, the guest network is
enabled, and guests can connect to your network using the SSID of this profile.
• Enable SSID Broadcast. If this check box is selected, the wireless access point
broadcasts its name (SSID) to all wireless stations. Stations with no SSID can adopt the correct SSID for connections to this access point.
• Allow guest to see each other and access my local network. If this check box is
selected, anyone who connects to this SSID has access to your local network, not just Internet access.
6. Give the guest network a name.
The guest network name is case-sensitive and can be up to 32 characters. You then manually configure the wireless devices in your network to use the guest network name in addition to the main SSID.
7. Select a radio button for a security option.
The WPA2 options use the newest standard for the strongest security, but some older computers and wireless devices cannot use it. NETGEAR recommends that you select the WPA-PSK [TKIP] + WPA2-PSK [AES] radio button. This setting protects your WiFi network and lets computers and wireless devices can connect to the WiFi network by using either WPA2 or WPA security.
8. Click the Apply button.
Your settings are saved.

Control the Wireless Radios

The modem router has an internal wireless radios that broadcasts signals in the 2.4 GHz range and 5 GHz range. By default, these radios are on so that you can connect wirelessly to the modem router. When the wireless radios are off, you can still use an Ethernet cable for a LAN connection to the modem router.
You can turn the wireless radios on and off with the WiFi On/Off button on the modem router, or you can log in to the modem router and enable or disable the wireless radios. If you are close to the modem router, it might be easier to press its WiFi On/Off button. If you are away from the modem router or have already logged in, it might be easier to enable or disable the radios.

Use the WiFi On/Off Button

To turn the wireless radios off and on with the WiFi On/Off button:
Press the WiFi On/Off button on the modem router for two seconds.
If you turned off the wireless radios, the WiFi On/Off LED and the WPS LED turn off. If you turned on the wireless radios, the WiFi On/Off LED and the WPS LED light.
Specify Network Settings User Manual59
N600 WiFi Cable Modem Router Model C3700

Enable or Disable the Wireless Radios

If you used the WiFi On/Off button to turn off the wireless radios, you can’t log in to the modem router to turn them back on. You must press the WiFi On/Off button again for two seconds to turn the wireless radios back on.
To enable or disable the wireless radios:
1. Laun
2. Ty
3. Enter
4. Select ADV
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
the modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
ANCED > Advanced Setup > Wireless Settings.
min. The default password is password. The user name and
5. Select or clear the Enable Wireless Gateway Radio check box.
Clearing this check box turns off the WiFi feature of the modem router.
6. Click the App
If you turned off the wireless radios, the WiFi On/Off LED and the WPS LED turn off. If you
turned on the wireless radios, the WiFi On/Off LED and the WPS LED light.
Specify Network Settings User Manual60
ly button.

Specify WPS Settings

Wi-Fi Protected Setup (WPS) lets you join the WiFi network without typing the WiFi password.
To specify WPS Settings:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Advanced Setup > Wireless Settings.
The Router’s PIN field displays the PIN that you use on a registrar (for example, from the Network Explorer on a Vista Windows computer) to configure the modem router’s wireless settings through WPS.
5. (Optional) Select or clear the Disable Router’s PIN check box.
The PIN function might temporarily be disabled when the modem router detects suspicious attempts to break into the modem router’s wireless settings by using the modem router’s PIN through WPS. You can manually enable the PIN function by clearing the Disable Router’s PIN check box.
6. (Optional) Select or clear the Keep Existing Wireless Settings check box.
By default, the Keep Existing Wireless Settings check box is selected. NETGEAR recommends that you leave this check box selected.
If you clear this check box, the next time a new wireless client uses WPS to connect to the modem router, the modem router wireless settings change to an automatically generated random SSID and security key.
7. Click the Apply button.
Your changes are saved.

Set Up a Wireless Card Access List

By default, any wireless computer or device that is configured with the correct SSID is allowed access to your wireless network. For increased security, allow only specific wireless computers and devices to access the wireless network based on their MAC addresses.
Specify Network Settings User Manual61
N600 WiFi Cable Modem Router Model C3700
To set up wireless card access:
1. Laun
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
2. Ty
A login screen displays.
3. Enter
the modem router user name and password.
The user name is ad
min. The default password is password. The user name and
password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Advanced Setup > Wireless Settings.
5. Click the Set
6. Select the T
Up Access List button.
urn Access Control On check box.
7. Click the Set Up Access List button.
Specify Network Settings User Manual62
N600 WiFi Cable Modem Router Model C3700
The Wireless Card Access List screen displays.
8. In the Network Profiles (2.4 GHz b/g/n) list, select the radio button for the SSID (WiFi network) that you want to use the access list for.
9. Select th
e Turn Access Control On check box and select one of the following radio
buttons:
• Allow List. Allo
• Deny List. Den
w computers and devices in the list to connect with WiFi.
y WiFi access to computers and devices in the list.
10. Click the Ad
The screen displays a list of available wireless card
o add a device from the Available Wireless Cards list, do the following:
11. T
a. Select
b. Click the Add but
The device displays in the wirel
12. T
o add a computer or device that is not in the list, do the following:
a. T
ype a name in the Device Name field.
b. T
ype the MAC address in the MAC Address field.
d button.
s.
the device.
ton.
ess card access list.
The MAC address is found on the computer or device.
c. Click the Add but
The device displays in the wirel
13. Click the Ap
ply button.
ton.
ess card access list.
Your changes are saved.
Specify Network Settings User Manual63
N600 WiFi Cable Modem Router Model C3700

Dynamic DNS

If your Internet service provider (ISP) gave you a permanently assigned IP address, you can register a domain name and have that name linked with your IP address by public Domain Name Servers (DNS). However, if your Internet account uses a dynamically assigned IP address, you do not know in advance what your IP address is, and the address can change frequently. In this case, you can use a commercial Dynamic DNS service. This type of service lets you register your domain to their IP address and forwards traffic directed at your domain to your frequently changing IP address.
If your ISP assigns a private WAN IP address (su DNS service does not work because private addresses are not routed on the Internet.
Your modem router contains a client that can DynDNS.org provided. First visit their website at account and host name that you configure in the modem router. Then, whenever your ISP-assigned IP address changes, your modem router automatically contacts the Dynamic DNS service provider, logs in to your account, and registers your new IP address. If your host name is hostname, for example, you can reach your modem router at http://hostname.dyndns.org.
To set up Dynamic DNS:
1. Laun
2. Ty
3. Enter
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
the modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
min. The default password is password. The user name and
ch as 192.168.x.x or 10.x.x.x), the Dynamic
connect to the Dynamic DNS service that
http://www.dyndns.org and obtain an
4. Select ADVANCED > Adv
5. Register for an account with one of the Dynamic DNS service providers whose URLs display in the Service Provider list.
6. Select the Use a
Specify Network Settings User Manual64
Dynamic DNS Service check box.
anced Setup > Dynamic DNS.
7. Select the URL for your Dynamic DNS service provider.
For example, if your Dynamic DNS service provider is DynDNS.org, select
www.dyndns.org.
8. Type the host name (or domain name) that your Dynamic DNS service provider gave you.
9. Type the user name for your Dynamic DNS account. This name is the name that you use to
log in to your account, not your host name.
10. Type the password (or key) for your Dynamic DNS account.
11. Click the Apply button.
Your configuration is saved.

Improve Network Connections with Universal Plug and Play

Universal Plug and Play (UPnP) helps devices, such as Internet appliances and computers, access the network and connect to other devices as needed. UPnP devices can automatically discover the services from other registered UPnP devices on the network.
If you use applications such as multiplayer gaming, peer-to-peer connections, or real-time communications such as instant messaging or remote assistance (a feature in Windows XP), enable UPnP.
To enable Universal Plug and Play:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
Specify Network Settings User Manual65
N600 WiFi Cable Modem Router Model C3700
4. Select ADVANCED > Advanced Setup > UPnP.
5. Select the Turn UPn P On check box.
By default, this check box is selected. If the Tu
rn UPnP On check box is cleared, the
modem router does not allow any device to automatically control router resources, such as port forwarding.
ype the advertisement period in minutes.
6. T
The advertisement period specifies how often the modem
router broadcasts its UPnP information. This value can range from 1 to 1440 minutes. The default period is 30 minutes. Shorter durations ensure that control points have current device status at the expense of more network traffic. Longer durations can compromise the freshness of the device status, but can significantly reduce network traffic.
ype the advertisement time to live in hops.
7. T
The time to live for the advertisement is measured in hop
s (steps) for each UPnP packet sent. Hops are the steps a packet takes between routers. The number of hops can range from 1 to 255. The default value for the advertisement time to live is 4 hops, which should be fine for most home networks. If you notice that some devices are not being updated or reached correctly, it might be necessary to increase this value.
8. Click the Appl
The UPnP Portmap Table displays the IP address o
y button.
f each UPnP device that is accessing the modem router and which ports (internal and external) that device has opened. The UPnP Portmap Table also displays what type of port is open and whether that port is still active for each IP address.
9. T
o refresh the information in the UPnP Portmap Table, click the Refresh button.
Specify Network Settings User Manual66
7

7Manage Your Network

This chapter describes the modem router settings for administering and maintaining your modem router and home network.
This chapter includes the following sections:
• View Modem Router Status
• Reboot the Modem Router
• Change the Router Mode
• View Logs of Modem Router Activity
• View a Network Map
• Manage the Modem Router Configuration File
• Change the admin Password
• View Event Logs
• Run the Ping Utility
• View Wireless Access Points in Your Area
• View or Change the Modem Router Wireless Channel
• Remote Management
67
N600 WiFi Cable Modem Router Model C3700
Scroll to view more

View Modem Router Status

To view modem router status and usage information:
1. Laun
2. Ty
3. Enter th
4. Select AD
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
e modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
VANCED.
The following screen displays.
min. The default password is password. The user name and

View Cable Information

To view modem router cable information:
1. Laun
2. Ty
3. Enter th
Manage Your Network User Manual68
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
e modem router user name and password.
The user name is ad password are case-sensitive.
min. The default password is password. The user name and
The BASIC Home screen displays.
4. Select ADVANCED.
The Cable Information pane displays the following:
• Hardware Version. The modem router model.
• Firmware Version. The version of the modem router firmware. It changes if you
upgrade the modem router firmware.
• Cable Modem Serial Number. The serial number of the cable modem.
• CM Certificate. The status of the cable modem certificate. If Not installed displays as
the status, contact your Internet service provider.
•CM MAC. The MAC address of the cable modem.
•LAN Port. The MAC address of LAN port 1. The following information also displays:
-MAC Address. The Media Access Control address. This address is the unique
physical address that the Ethernet (LAN) port of the modem router uses.
-IP Address. The IP address that the Ethernet (LAN) port of the modem router uses. The default is 192.168.0.1.
- DHCP Server. Identifies whether the built-in DHCP server of the modem router is active for the LAN-attached devices.
For information about using the Reboot button, see Reboot the Modem Router on page 71.

View Internet Port Information

To view modem router Internet port information:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED.
The Cable Information pane displays the following:
The Internet Port pane displays these WAN Internet port settings:
•MAC Address. The MAC address of the WAN Internet port.
• IP Address/Mask. The IP address of the WAN Internet port.
• Connection. The type of WAN Internet port connection.
• Default Gateway. The IP address of the default gateway.
Manage Your Network User Manual69
• Domain Name Server. The IP address of the Domain Name Server.

Wireless Settings

To view wireless settings:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED.
The Wireless Settings (2.4 GHz) and Wireless Settings (5 GHz) panes display the following information:
• Name (SSID). The wireless network name (SSID) that the modem router uses.
• Region. The geographic region where the modem router is being used. It is illegal to
use the wireless features of the modem router in some parts of the world.
• Channel. The operating channel of the wireless port being used. The default channel is Auto. When Auto is selected, the modem router finds the best operating channel available.
•Mode. The wireless communication mode: Up to 54 Mbps, Up to 145 Mbps (default), and Up to 300 Mbps.
• Wireless AP. Indicates whether the modem router WiFi radios are on or off. If the wireless radios are turned off, the WiFi On/Off LED on the front panel is off.
• Broadcast Name. Indicates whether the modem router is broadcasting its SSID.
• Wi-Fi Protected Setup. Indicates whether Wi-Fi Protected Setup is configured for
this network.
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N600 WiFi Cable Modem Router Model C3700

Reboot the Modem Router

Rebooting the modem router disconnects all computers and mobile devices from the modem router’s network.
To reboot the modem router:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
ype http://routerlogin.net or http://192.168.0.1.
2. T
A login screen displays.
nter the modem router user name and password.
3. E
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
4. Select AD
5. In the Cable Information pane, click the Reboot button.
VANCED.
in. The default password is password. The user name and
A confirmation message displays.
6. Click the OK butt
The modem router reboots.
Manage Your Network User Manual71
on.
N600 WiFi Cable Modem Router Model C3700

Change the Router Mode

By default, the modem router is in router mode. This means that it works both as a modem and as a router. You can share the Internet connection without using another router or gateway. If you want to connect a gateway or router to the modem router, you must log in to the modem router and change its Router Mode setting.
To change the router mode:
1. On
2. Join
3. Lau
4. Ty
5. Enter
6. Select AD
your computer or wireless device, find and select the modem router WiFi network.
The WiFi network name is on the modem router’s label.
the WiFi network and enter the WiFi password.
The password is on the modem router’s label.
Your wireless device connects to the WiFi network.
nch a web browser.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
the modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
VANCED > Administration > Router Mode.
min. The default password is password. The user name and
7. Select one of the radio buttons:
•Yes. Th
Network Address Translation (NAT).
•No. With
from the Internet service provider.
8. Click the Appl
Your change takes effect.
Manage Your Network User Manual72
is is the default setting. The modem router performs router functions such as
this setting, the modem router works as a bridge and obtains IP addresses
y button.
N600 WiFi Cable Modem Router Model C3700

View Logs of Modem Router Activity

The log is a detailed record of the websites you have accessed or attempted to access. Up to 256 entries are stored in the log. Log entries display only when No log entries are made for the trusted LAN client.
To view logs:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
nter the modem router user name and password.
3. E
keyword blocking is enabled.
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
4. Select AD
VANCED > Administration > Logs.
in. The default password is password. The user name and
The log screen shows the following information:
• Description. Th
• Count. The n
• Last Occurrence. T
• Target.
access was attempted.
•Source. The source IP add
5. T
o customize the log, clear or select the following check boxes:
Manage Your Network User Manual73
The name or IP address of the website or news group visited or to which
e action that occured.
umber of occurences.
he date and time the log entry was recorded.
ress of the initiating device for this log entry.
N600 WiFi Cable Modem Router Model C3700
• Attempted access to allowed sites
• Attempted acce
ss to blocked sites and services
• Connection
• Ga
• Known DoS att
• Port Forward
6. T
7. T
8. T
9. T
teway operation (startup, get time etc.)
o save your changes, click the Apply button.
o refresh the log screen, click the Refresh button.
o clear the log entries, click the Clear Log button.
o send the log immediately, click the Send Log button.
s to the Web-based interface of this Gateway
acks and Port Scans
ing/Port Triggering

View a Network Map

The network map displays information about devices connected to your network.
To view the network map:
1. Laun
2. Ty
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter th
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
4. Select AD
The screen displays the modem router, its Internet connection, and all devices that are currently connected to the modem router network.
e modem router user name and password.
min. The default password is password. The user name and
VANCED > Administration > Network Map.
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N600 WiFi Cable Modem Router Model C3700

Manage the Modem Router Configuration File

The configuration settings of the modem router are stored within the modem router in a configuration file. You can back up (save) this file to your computer, restore it, or reset it to the factory default settings.

Back Up Settings

To back up the modem router’s configuration settings:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
nter the modem router user name and password.
3. E
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
4. Select ADV
5. Click the Back Up button.
6. W
hen prompted, specify a location on your network.
A copy of the current settings is saved in the location you specified.
ANCED > Administration > Backup Settings.
in. The default password is password. The user name and

Restore Configuration Settings

To restore configuration settings that you backed up:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
Manage Your Network User Manual75
WARNING:
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Administration > Backup Settings.
5. Click the Browse button to find and select the .cfg file.
6. Click the Restore button.
The file is uploaded to the modem router and the modem router reboots.
Do not interrupt the reboot process.

Erase the Current Configuration Settings

You can erase the current configuration and restore the factory default settings. You might want to do this if you move the modem router to a different network. (For more information, see
Factory Default Settings on page 102.)
To erase the configuration settings:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Administration > Backup Settings.
5. Click the Erase button.
The factory default settings are restored. The user name is admin, the password is password, and the LAN IP address is 192.168.0.1. DHCP is enabled.
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N600 WiFi Cable Modem Router Model C3700

Change the admin Password

You can the default password that is used to log in to the modem router with the user name admin. This password is not the one that you use for WiFi access. The label on your modem router shows your unique wireless network name (SSID) and password for wireless access.
To set the password for the user name admin:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
nter the modem router user name and password.
3. E
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
4. Select ADV
5. Type the old password.
6. T
ype the new password in the Set Password field.
7. T
ype the new password in the Repeat New Password field.
8. Click the Ap
Your change takes effect.
ANCED > Administration > Set Password.
ply button.
in. The default password is password. The user name and

View Event Logs

Event logs capture important modem router events.
To view the event logs:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
ype http://routerlogin.net or http://192.168.0.1.
2. T
A login screen displays.
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N600 WiFi Cable Modem Router Model C3700
3. Enter the modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
4. Select ADV
ANCED > Administration > Event Log.
min. The default password is password. The user name and
The log screen shows the following information:
•Time. The
•Priority. T
• Description. A descript
5. T
o refresh the log screen, click the Refresh button.
o clear the log entries, click the Clear Log button.
6. T
time the event log entry was recorded.
he severity for this event log entry.
ion of this event log entry.

Run the Ping Utility

Ping is an administration utility that tests whether a computer on the network is reachable and measures the time it takes messages sent from the originating device to reach a destination computer and return.
To run a ping test:
1. Laun
2. Ty
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
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N600 WiFi Cable Modem Router Model C3700
3. Enter the modem router user name and password.
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
4. Select ADV
In the Utilit
5. Specify the following parameters for the ping utility:
• Target.
ANCED > Administration > Diagnostics.
y list, Ping is selected by default.
The IP address of the ping target computer.
in. The default password is password. The user name and
•Ping Size.
• No. of Pings. Th
• Ping Interval.
6. Click the S
The ping results display.
7. T
o stop a ping test, click the Abort Test button.
8. T
o clear the results from the display, click the Clear Results button.
The size (in bytes) of the ping packet.
e number of times to ping the target computer.
The time between pings.
tart Test button.

Run the Traceroute Utility

To display the route and measure transit delays of packets across an IP, run the traceroute utility.
To run a traceroute test:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
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N600 WiFi Cable Modem Router Model C3700
A login screen displays.
3. Enter th
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
4. Select A
5. In
e modem router user name and password.
min. The default password is password. The user name and
DVANCED > Administration > Diagnostics.
the Utility list, select Traceroute.
6. Specify the following parameters for the traceroute utility:
•Target. The
•Max Hops. Th
• Data Size. The
• Base Port. Th
• Resolve Host. Sele
7. Click the St
The traceroute results display.
o clear the results from the display, click the Clear Results button.
8. T
IP address or host name of the computer you are tracing.
e maximum number of hops to allow when tracing the route.
input the size (in bytes) of the packet.
e port number to send the packet to.
ct On to resolve the host name to the IP address.
art Test button.

View Wireless Access Points in Your Area

You can view wireless networks, or access points, in your area and to select and join a wireless network.
Manage Your Network User Manual80
N600 WiFi Cable Modem Router Model C3700
To manage your wireless access point (AP):
1. L
aunch a web browser from a computer or wireless device that is connected to the
network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
nter the modem router user name and password.
3. E
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
4. Select ADV
ANCED > Administration > Wireless AP.
in. The default password is password. The user name and
On this screen, you can view wireless access points in use in your area.

View or Change the Modem Router Wireless Channel

To view or change your wireless channel:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
nter the modem router user name and password.
3. E
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N600 WiFi Cable Modem Router Model C3700
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADV
The screen displays wireless channels in use in the 2.4 GHz WiFi band. Your network is shown in blue. Yellow shows other networks in your area. Many countries and geographic locations have laws or guidelines about which channels can be used. Depending on your location, some channels might not be available.
If many wireless networks at your location use the network, you might experience interference. You can change the channel to avoid the interference.
ANCED > Administration > Wireless Channel.
same channel as your wireless
5. T
o view wireless channels in use in the 5 GHz WiFi band, select the 5 GHz a/n radio button.
6. T
o change the wireless channel, click the Change Channel button.
The Wireless Setup screen displays.
the Channel list, select a different channel setting.
7. In
8. Click the Appl
Your changes take effect.
y button.

Remote Management

The remote management feature lets you access your modem router over the Internet to view or change its settings.
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N600 WiFi Cable Modem Router Model C3700
Note: Be sure to change the modem router login password to a secure
password. The ideal password contains no dictionary words from any language and contains uppercase and lowercase letters, numbers, and symbols. It can be up to 30 characters. See
Change the admin
Password on page 77.
To set up remote management:
aunch a web browser from a computer or wireless device that is connected to the
1. L network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
nter the modem router user name and password.
3. E
The user name is adm
in. The default password is password. The user name and
password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Advanced Setup > Remote Management.
5. Select the Turn Remote Management On check box.
6. Unde
r Allow Remote Access By, specify the external IP addresses to be allowed to access
the modem router’s remote management.
For enhanced security, restrict access to as few external IP addre
sses as practical.
Select one of the following:
o allow access from a single IP address on the Internet, select the Only This
• T
Computer radio button. Enter the IP address that will be allowed access.
• T
o allow access from a range of IP addresses on the Internet, select the IP Address
Range radio button. Enter a beginning and ending IP address.
• T
o allow access from any IP address on the Internet, select the Everyone radio
button.
Manage Your Network User Manual83
7. Specify the port number for accessing the web management interface.
Normal web browser access uses the standard HTTP service port 80. For greater security, enter a custom port number for the remote web management interface. Choose a number from 1024 to 65535, but do not use the number of any common service port. The default is 8080, which is a common alternate for HTTP.
8. Click the Apply button.
Your changes take effect.
To use remote access:
1. Launch a web browser on a computer that is not on your home network.
2. Type your modem router’s WAN IP address into your browser’s address or location field
followed by a colon (:) and the custom port number.
For example, if your external address is 134.177.0.123 and you use port number 8080, enter http://134.177.0.123:8080 in your browser.
Manage Your Network User Manual84
8

8Specify Internet Port Settings

You can use port forwarding and port triggering to set up rules for Internet traffic. You need networking knowledge to set up these features.
This chapter includes the following sections:
• Set Up Port Forwarding to a Local Server
• Set Up Port Triggering
85
N600 WiFi Cable Modem Router Model C3700

Set Up Port Forwarding to a Local Server

If you have a server in your home network, you can allow certain types of incoming traffic to reach the server. For example, you might want to make a local web server, FTP server, or game server visible and available to the Internet.
The modem router can forward incoming traffic with sp local network. You can specify the servers for applications and you can also specify a default DMZ server to which the modem router forwards all other incoming protocols.
To forward specific incoming protocols:
1. Decide which type
2. Fin
3. Lau
4. Ty
5. Enter th
6. Select ADV
d the local IP address of the computer on your network that will provide the service.
The server computer must always have the same IP ad the reserved IP address feature. See
nch a web browser from a computer or wireless device that is connected to the network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
e modem router user name and password.
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
ANCED > Advanced Setup > Port Forwarding/Port Triggering.
of service, application, or game you want to provide.
Reserve LAN IP Addresses on page 52.
min. The default password is password. The user name and
ecific protocols to computers on your
dress. To specify this setting, use
7. Leave the Port Forwarding radio button selected as the service type.
the Service Name list, select the service name.
8. In
Specify Internet Port Settings User Manual86
N600 WiFi Cable Modem Router Model C3700
If the service that you want to add is not in the list, create a custom service. See Add a Custom Port Forwarding Service on page 87.
9. In the Server IP Address field, enter the IP service.
10. Click the Ad
The service displays in the list.
d button.
address of the computer that will provide the

Add a Custom Port Forwarding Service

To add a custom service:
ind out which port number or range of numbers the application uses.
1. F
You can usually find this information by contacting the pu groups or news groups.
2. Launch a web bro
3. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
nter the modem router user name and password.
4. E
The user name is adm password are case-sensitive.
wser from a computer or wireless device that is connected to the network.
in. The default password is password. The user name and
blisher of the application or user
The BASIC Home screen displays.
5. Select ADV
6. Leave the Po
7. Click the Ad
8. In the Service Name field, enter a descriptive name.
9. In the Servic
10. In the Extern
If the application uses a single port, enter the same port number in the Ending Port field.
ANCED > Advanced Setup > Port Forwarding/Port Triggering.
rt Forwarding radio button selected as the service type.
d Custom Service button.
e Type field, select the protocol. If you are unsure, select TCP/UDP.
al Starting Port field, enter the beginning port number.
Specify Internet Port Settings User Manual87
If the application uses a range of ports, enter the ending port number of the range in the
External Ending Port field.
11. Type the port numbers in the Internal Starting Port and Internal Ending Port fields.
12. Type the IP address in the Internal IP address field or select the radio button for an
attached device listed in the table.
13. Click the Apply button.
The service is now in the list on the Port Forwarding/Port Triggering screen.

Edit a Port Forwarding Service

To edit a port forwarding entry:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Advanced Setup > Port Forwarding/Port Triggering.
5. Leave the Port Forwarding radio button selected as the service type.
6. In the table, select the radio button next to the service name.
7. Click the Edit Service button.
The Ports - Custom Services screen displays.
8. Specify changes to any of the following settings:
• Service Name. Type the service name.
• Service Type. If you are unsure, select TCP/UDP.
• External Starting Port. If the application uses a single port, enter the same port
number in the External Ending Port field. If the application uses a range of ports, enter the ending port number of the range in the External Ending Port field.
• Internal Starting Port. By default, this is the same as the Internal Ending Port value.
• Internal IP address. Type the IP address in the Internal IP address field, or select the
radio button for an attached device listed in the table.
9. Click the Apply button.
Your changes are saved.
Specify Internet Port Settings User Manual88

Delete a Port Forwarding Entry

To delete a port forwarding entry:
1. Launch a web browser from a computer or wireless device that is connected to the
network.
2. Type http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter the modem router user name and password.
The user name is admin. The default password is password. The user name and password are case-sensitive.
The BASIC Home screen displays.
4. Select ADVANCED > Advanced Setup > Port Forwarding/Port Triggering.
5. Select the Port Forwarding radio button as the service type
6. In the table, select the radio button next to the service name.
7. Click the Delete Service button.

Application Example: Make a Local Web Server Public

If you host a web server on your local network, you can use port forwarding to allow web requests from anyone on the Internet to reach your web server.
To make a local web server public:
1. Assign your web server either a fixed IP address or a dynamic IP address using DHCP
address reservation.
In this example, your modem router always gives your web server an IP address of
192.168.0.33.
2. In the Port Forwarding/Port Triggering screen, configure the modem router to forward the HTTP service to the local address of your web server at 192.168.0.33.
HTTP (port 80) is the standard protocol for web servers.
3. (Optional) Register a host name with a Dynamic DNS service, and specify that name in the Dynamic DNS screen of the modem router. For more information, see page 64.
Dynamic DNS makes it much easier to access a server from the Internet because you can type the name in the Internet browser. Otherwise, you must know the IP address that the ISP assigned, which typically changes.
Dynamic DNS on
Specify Internet Port Settings User Manual89

How the Modem Router Implements the Port Forwarding Rule

The following sequence shows the effects of a port forwarding rule:
1. When you type the URL www.example.com in your browser, the browser sends a web page request message with the following destination information:
• Destination address. The IP address of www.example.com, which is the address of
your modem router.
• Destination port number. 80, which is the standard port number for a web server
process.
2. Your modem router receives the message and finds your port forwarding rule for incoming port 80 traffic.
3. The modem router changes the destination in the message to IP address 192.168.0.123 and sends the message to that computer.
4. Your web server at IP address 192.168.0.123 receives the request and sends a reply message to your modem router.
5. Your modem router performs Network Address Translation (NAT) on the source IP address, and sends the reply through the Internet to the computer or wireless device that sent the web page request.

Set Up Port Triggering

Port triggering is a dynamic extension of port forwarding that is useful in these cases:
• An application uses port forwarding to more than one local computer (but not simultaneously).
• An application opens incoming ports that are different from the outgoing port.
With port triggering, the modem router monitors traffic to the Internet from an outbound “trigger” port that you specify. For outbound traffic from that port, the modem router saves the IP address of the computer that sent the traffic. The modem router temporarily opens the incoming port or ports that you specify in your rule, and forwards that incoming traffic to that destination.
Port forwarding creates a static mapping of a port number or range of ports to a single local computer. Port triggering can dynamically open ports to any computer when needed and close the ports when they are no longer needed.
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N600 WiFi Cable Modem Router Model C3700
Note: If you use applications such as multiplayer gaming, peer-to-peer
connections, real-time communications such as instant messaging, or remote assistance (a feature in Windows XP), enable Universal Plug and Play (UPnP). See
Plug and Play on page 65.
Improve Network Connections with Universal

Add a Port Triggering Service

To add a port triggering service:
1. L
aunch a web browser from a computer or wireless device that is connected to the
network.
2. T
ype http://routerlogin.net or http://192.168.0.1.
A login screen displays.
nter the modem router user name and password.
3. E
The user name is adm password are case-sensitive.
The BASIC Home screen displays.
4. Select ADV
5. Select th
ANCED > Advanced Setup > Port Forwarding/Port Triggering.
e Port Triggering radio button.
in. The default password is password. The user name and
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N600 WiFi Cable Modem Router Model C3700
6. Click the Add Service button.
7. In the Service Name field, type a descriptive service name.
8. In
the Service User list, select Any, or select Single address and enter the IP address of
one computer:
•Any (the
• Single address restrict
default) allows any computer on the Internet to use this service.
s the service to a particular computer.
9. Select the service type,
If you are not sure, select TCP/UDP.
10. In
the Triggering Port field, enter the number of the outbound traffic port that will open the
inbound ports.
11. Enter th Ending Port fields.
12. Click the Appl
The service is now in the Portmap table. You must enable port triggering before the mod port triggering, see
e inbound connection port information in the Connection Type, Starting Port, and
y button.
em router uses port triggering for the service that you added. For information about
either TCP or UDP or TCP/UDP (both).
Specify When to Use Port Triggering on page 92.

Specify When to Use Port Triggering

To specify when to use port triggering:
1. Laun
2. Ty
ch a web browser from a computer or wireless device that is connected to the
network.
pe http://routerlogin.net or http://192.168.0.1.
A login screen displays.
3. Enter th
The user name is ad password are case-sensitive.
The BASIC Home screen displays.
Specify Internet Port Settings User Manual92
e modem router user name and password.
min. The default password is password. The user name and
N600 WiFi Cable Modem Router Model C3700
4. Select ADVANCED > Advanced Setup > Port Forwarding/Port Triggering.
5. Select th
6. Select a radio button to specify when you want to use port triggering:
• Never. The mo
• Per Schedule. Port
• Always.
7. In the Po
e Port Triggering radio button.
dem router does not use port triggering even if you have specified port
triggering settings.
triggering is used based on the settings in the Schedule screen.
Always use port triggering.
rt Triggering Timeout field, enter a value up to 9999 minutes.
This value controls how long the inbound ports stay open when the modem router detects n
o activity. This value is required because the modem router cannot detect when the
application terminates.

Application Example: Port Triggering for Internet Relay Chat

Some application servers, such as FTP and IRC servers, send replies to multiple port numbers. Using port triggering, you can tell the modem router to open more incoming ports when a particular outgoing port starts a session.
An example is Internet Relay Chat (IRC). Your computer connects to an IRC server at
estination port 6667. The IRC server not only responds to your originating source port, but
d also sends an “identify” message to your computer on port 113. Using port triggering, you can tell the modem router, “When you initiate a session with destination port 6667, you must also allow incoming traffic on port 113 to reach the originating computer.” The following sequence shows the effects of the port triggering rule you have defined:
1. Y
ou open an IRC client program to start a chat session on your computer.
2. Y
our IRC client composes a request message to an IRC server using a destination port number of 6667, the standard port number for an IRC server process. Your computer then sends this request message to your modem router.
Specify Internet Port Settings User Manual93
3. Your modem router creates an entry in its internal session table describing this communication session between your computer and the IRC server. Your modem router stores the original information, performs Network Address Translation (NAT) on the source address and port, and sends this request message through the Internet to the IRC server.
4. Noting your port triggering rule and observing the destination port number of 6667, your modem router creates another session entry to send any incoming port 113 traffic to your computer.
5. The IRC server sends a return message to your modem router using the NAT-assigned source port (for example, port 33333) as the destination port. The IRC server also sends an “identify” message to your modem router with destination port 113.
6. When your modem router receives the incoming message to destination port 33333, it checks its session table to see if a session is active for port number 33333. Finding an active session, the modem router restores the original address information replaced by NAT and sends this reply message to your computer.
7. When your modem router receives the incoming message to destination port 113, it checks its session table and finds an active session for port 113 associated with your computer. The modem router replaces the message’s destination IP address with your computer’s IP address and forwards the message to your computer.
8. When you finish your chat session, your modem router eventually senses a period of inactivity in the communications. The modem router then removes the session information from its session table, and incoming traffic is no longer accepted on port numbers 33333 or
113.
Specify Internet Port Settings User Manual94
9

9Troubleshooting

This chapter gives information about troubleshooting your modem router.
This chapter includes the following sections:
• Use LEDs to Troubleshoot
• Cannot Log In to the Modem Router
• Cannot Log In to the Modem Router
• Troubleshoot a TCP/IP Network Using a Ping Utility
Tip: NETGEAR provides helpful articles, documentation, and the latest
software updates at
support.netgear.com.
95
N600 WiFi Cable Modem Router Model C3700

Use LEDs to Troubleshoot

The following table provides help when using the LEDs for troubleshooting.
LED Behavior Action
All LEDS are off when the modem
ter is plugged in.
rou
All LEDs stay on. • Cl
LAN LED is off for a port with an Etherne
Internet LED is off and the modem router is connected to the cable television cable.
t connection.
Make sure that the power cord is properly connected to your modem router and that the power adapter is properly connected to a functioning power outlet.
Check that you are using the 12 VDC power adapter from NETGEAR for th
If the error persists, you have a hardware problem. Contact technical
port.
sup
This operation sets the IP address of the modem router to
192.168.0.1. See Factory Default Settings on page 102.
• If the technical support.
• Make sure that the Ethernet cable connections are secure at the modem router and at the hub or computer.
• Make computer.
• Be
• Make sure that the coaxial cable connections are secure at the
modem router and at the wall jack.
• Make cable Internet service. Your provider can verify that the signal quality is good enough for modem router service.
• Rem Run a “home run” back to the point where the cable enters your home.
is product.
ear the configuration of the modem router to its factory defaults.
error persists, you have a hardware problem. Contact
sure that power is turned on to the connected hub or
sure that you are using the correct cable.
sure that your cable service provider has provisioned your
ove any excessive splitters that you have on your cable line.

Cannot Log In to the Modem Router

If you cannot access the modem router from a computer on your local network, check the following:
• If you are device is connected to the correct WiFi network.
• If your co connection.
• Make sure tha If you are using the recommended addressing scheme, the address of your computer is in the range of 192.168.0.10 to 192.168.0.254.
Troubleshooting User Manual96
using a WiFi connection, check to make sure that your computer or mobile
mputer is connected to the modem router wtih an Ethernet cable, check the
t your computer’s IP address is on the same subnet as the modem router.
Note: If the IP address of your computer is shown as 169.254.x.x:
Recent versions of Windows and Mac OS generate and assign an IP address when the computer cannot reach a DHCP server. These autogenerated addresses are in the range of 169.254.x.x. If your IP address is in this range, check the connection from the computer to the modem router and reboot your computer.
• If the IP address of your modem router has been changed and you do not know its current IP address, clear the configuration of the modem router to its factory defaults. This sets the IP address of the modem router to 192.168.0.1. For more information, see Factory Default Settings on page 102.
• Make sure that your browser has Java, JavaScript, or ActiveX enabled. If you are using Internet Explorer, click the Refresh button to make sure that the Java applet is loaded.
• Try quitting the browser and launching it again.
• Make sure that you are using the correct login information. The modem router user name admin is lowercase (Caps Lock is off). The default password is password.
If the modem router does not save changes you have made, do the following:
• When entering configuration settings, be sure to click the Apply button before moving to another screen, or your changes are lost.
• Click the Refresh or Reload button in the web browser. The changes have occurred, but the web browser might be caching the old configuration.

Troubleshoot the ISP Connection

When your modem router cannot access the Internet and your Internet LED is on, register the cable MAC address or device MAC address of your modem router with your cable service provider.
Additionally, your computer might not have the modem router configured as its TCP/IP gateway. If your computer obtains its information from the modem router by DHCP, reboot the computer and verify the gateway address.

Troubleshoot a TCP/IP Network Using a Ping Utility

Most TCP/IP terminal devices and routers contain a ping utility that sends an echo request packet to the designated device. The device then responds with an echo reply. You can
Troubleshooting User Manual97
easily troubleshoot a TCP/IP network by using the ping utility in your computer or workstation.
Troubleshooting User Manual98

Use PIng to Test the LAN Path to Your Gateway

You can use ping to verify that the LAN path to your modem router is set up correctly.
To ping the modem router from a computer running Windows 95 or later:
1. From the Windows toolbar, click the Start button and select Run.
2. In the field that is provided, type ping and then the IP address of the modem router, as in
this example:
ping 192.168.0.1
3. Click OK.
You see a message like the following:
Pinging <IP address> with 32 bytes of data
If the path is working, you see this message:
Reply from < IP address >: bytes=32 time=NN ms TTL=xxx
If the path is not working, you see this message:
Request timed out
If the path is not working correctly, you could have one of the following problems:
• Wrong physical connections.
- Make sure that the LAN LED is lit. If this LED is off. for more information, see Use
LEDs to Troubleshoot on page 96.
- Check the corresponding link LEDs are on for your network interface card and the hub ports (if any) that are connected to your workstation and modem router.
• Wrong network configuration.
- Verify that the Ethernet card driver software and TCP/IP software are both
installed and configured on your computer or workstation.
- Verify that the IP address for your modem router and your workstation are correct and that the addresses are on the same subnet.

Use Ping to Test the Path from a Windows PC to a Remote Device

After verifying that the LAN path works correctly, test the path from the Windows PC to a remote device.
To test the path from a Windows PC to a remote device:
1. From the Windows run menu, type: ping -n 10 <IP address>
where <IP address> is the IP address of a remote device such as the DNS server of your ISP.
Troubleshooting User Manual99
If the path is working, you see this message:
Reply from < IP address >: bytes=32 time=NN ms TTL=xxx
2. If you do not receive this reply, do the following:
• Check that the Internet LED is lit.
• If your ISP assigned a host name to your computer, enter that host name as the
account name in the Internet Setup screen.
• Check that your computer has the IP address of your modem router is listed as the default gateway. If DHCP assigns the IP configuration of your computer, this information is not visible in the Network Control Panel of your computer. Verify that the IP address of the modem router is listed as the default gateway.
• Check that the network address of your computer (the portion of the IP address specified by the netmask) is different from the network address of the remote device.
Troubleshooting User Manual100
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