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Netgear C6900 User Manual

User Manual

Nighthawk AC1900 WiFi Cable Modem Router Model C6900
February 2021 202-12222-01
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Position Your Modem Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Cable Your Modem Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Cable the Modem Router in a Simple Network . . . . . . . . . . . . . . . . . . . .13
Cable Your Modem Router to a Router and Use Bridge Mode. . . . . . .13
Activate Your Internet Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Activate Your Internet Service With Comcast Xfinity . . . . . . . . . . . . . . . . . . 16
Connect to the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Wired Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
WiFi Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Types of Logins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Log In to the Modem Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Access the Modem Router with NETGEAR genie App . . . . . . . . . . . . . . . . 22
Chapter 3 Specify Your Internet Settings
Specify the Cable Connection Starting Frequency . . . . . . . . . . . . . . . . . . .24
View Modem Router Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Manually Set Up the Internet Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Specify an IPv6 Internet Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Change the MTU Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Chapter 4 Control Access to the Internet
Block Access to Your Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Use Keywords to Block Internet Sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Block Services from the Internet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Schedule When to Block Internet Sites and Services . . . . . . . . . . . . . . . . . . 35
Avoid Blocking on a Trusted Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Set Up Security Event Email Notifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Chapter 5 Specify Network Settings
View WAN Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
4
Set Up a Default DMZ Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Change the Modem Router’s Device Name . . . . . . . . . . . . . . . . . . . . . . . . .42
Change the LAN TCP/IP Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Specify the IP Addresses that the Modem Router Assigns . . . . . . . . . . . . .44
Disable the DHCP Server Feature in the Modem Router. . . . . . . . . . . . . . . 45
Reserve LAN IP Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Improve Network Connections with Universal Plug and Play . . . . . . . . . . . 47
Use the WPS Wizard for WiFi Connections . . . . . . . . . . . . . . . . . . . . . . . . . .48
Specify Basic WiFi Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Change the WiFi Security Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Set Up a Guest Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Control the Wireless Radios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Use the WiFi On/Off Button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Enable or Disable the Wireless Radios . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Set Up a Wireless Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Specify WPS Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Chapter 6 Manage Your Network
Change the admin Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
View Modem Router Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Display Internet Port Statistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Check the Internet Connection Status . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
View Logs of Modem Router Activity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
View Event Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Run the Ping Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Run the Traceroute Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Monitor Internet Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
View Devices Currently on the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Manage the Modem Router Configuration File . . . . . . . . . . . . . . . . . . . . . .69
Back Up Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Restore Configuration Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Erase the Current Configuration Settings . . . . . . . . . . . . . . . . . . . . . . . . .71
View Wireless Access Points in Your Area . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
View or Change the Modem Router Wireless Channel . . . . . . . . . . . . . . . . 72
Dynamic DNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Specify a DNS Account. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Change the Dynamic DNS Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Remote Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Chapter 7 Specify Internet Port Settings
Set Up Port Forwarding to a Local Server . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Add a Custom Port Forwarding Service . . . . . . . . . . . . . . . . . . . . . . . . . .79
Edit a Port Forwarding Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Delete a Port Forwarding Entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Application Example: Make a Local Web Server Public . . . . . . . . . . . . .81
How the Modem Router Implements the Port Forwarding Rule . . . . . .81
Set Up Port Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
User Manual5
Add a Port Triggering Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
Application Example: Port Triggering for Internet Relay Chat . . . . . . .84
Chapter 8 Troubleshooting
Troubleshoot with the LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Power LED Is Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
LEDs Never Turn Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Internet LED Is Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Troubleshoot the Cable Internet Connection . . . . . . . . . . . . . . . . . . . . . . . . 87
Cannot Log In to the Modem Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Changes Not Saved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
Wireless Connectivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Troubleshoot Your Network Using the Ping Utility . . . . . . . . . . . . . . . . . . . . 90
Test the LAN Path to Your Modem Router . . . . . . . . . . . . . . . . . . . . . . . .90
Test the Path from Your Computer to a Remote Device. . . . . . . . . . . . .91
Appendix A Supplemental Information
Factory Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
User Manual6
1

1Hardware Setup

This chapter covers the following topics:
• Unpack Your Modem Router
• Front Panel
• Rear Panel
• Position Your Modem Router
• Cable Your Modem Router
• Activate Your Internet Service
• Activate Your Internet Service With Comcast Xfinity
For more information about the topics covered in this manual, visit the support website at
http://support.netgear.com.
7
Nighthawk AC1900 WiFi Cable Modem Router
Ethernet cable
Power adapter
Modem router

Unpack Your Modem Router

Your package contains the following items.
Figure 1. Package contents
Hardware Setup User Manual8
Nighthawk AC1900 WiFi Cable Modem Router
Power LED
Downstream LED Upstream LED Internet LED
WPS button / LED
WiFi On/Off button
5 GHz LED
2.4 GHz LED
Ethernet LED

Front Panel

The modem router has status LEDs and buttons on the front.
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
Power
Downstream
Upstream
Hardware Setup User Manual9
• Green. Power is supplied to the modem router.
• Off. No
• Solid red. The
heat sources (such as a TV, DVD player, or speakers) and keep it vertical in open air.
• Solid amber. One downstream channel is locked.
• Solid green. T
• Blinking green. T
• Off. No downstream channel is locked.
• Solid amber. One upstream channel is locked.
• Solid green. Two or more upstream channels are locked.
• Blinking green. T
• Off.
power is supplied to the modem router.
rmal cutoff mode. Power off the unit, let it cool, and move it away from
wo or more downstream channels are locked.
he modem router is scanning for a downstream channel.
he modem router is scanning for an upstream channel.
No upstream channel is locked.
Nighthawk AC1900 WiFi Cable Modem Router
LED Description
Internet
2.4 GHz radio
5 GHz radio
• Solid green. The modem router is online.
• Blinking green.
modem termination system (CMTS).
• Slow blinking amber and green. T
(For information about the traffic meter, see Monitor Internet Traffic on page 67.)
• Off.
• 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.
The modem router is offline.
The modem router is synchronizing with the cable provider’s cable
he modem router reached the traffic meter limit.
Ethernet
WiFi On/Off but­ton with LED
WPS button with LED
• Green. A device is connected to an Ethernet port and powered on. Each Ethernet port has LEDs on the rear panel.
• Off. No device is co
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.
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.
nnected to an Ethernet port.
Hardware Setup User Manual10
Nighthawk AC1900 WiFi Cable Modem Router
Power adapter input
Ethernet LAN ports
Coaxial cable connector
Reset button

Rear Panel

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

Position Your Modem Router

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 aro router’s signal. Wireless access points are modem routers, repeaters, WiFi range extenders, or any other device that emits a wireless signal for network access.
Position your modem router accordin
• Place devices operate, and within line of sight to your wireless devices.
• Make sure t cables for wired computers.
Hardware Setup User Manual11
your modem router near the center of the area where your computers and other
hat the modem router is within reach of an AC power outlet and near Ethernet
g to the following guidelines:
und your home might affect your modem
• 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 doors
- Aluminum studs
- Fish tanks
- Mirrors
- Brick
- Concrete

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 Manual12
Nighthawk AC1900 WiFi Cable Modem Router
Internet
Power adapter
Ethernet cable

Cable the Modem Router in 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 in a simple network
To cable your modem router:
1. Con
2. Conn
3. Press the Power On/Off
You can log in to the modem router to view or change it
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.
For Xfinity cable Internet service, Comcast Xfinity recommends connecting your modem
uter to a cable wall outlet.
ro
ect the power adapter provided in the package to the modem router and plug the
power adapter in to an electrical outlet.
button on the rear panel of the modem router.
The Power LED lights green.
s settings.
connect the cable port on the

Cable Your Modem Router to a Router and Use Bridge Mode

If you want to cable the modem router to a router, 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 functions such as network address translation (NAT) and DHCP (assigning IP addresses to devices on the network). This turns the modem router into a bridged modem
Hardware Setup User Manual13
Nighthawk AC1900 WiFi Cable Modem Router
To cable your modem router to a gateway or router:
1. Connect a co
axial cable.
Use the coaxial cable that your cable company p modem router to a cable wall outlet or a line splitter.
For Xfinity cable Internet service, Comcast Xfinity reco router to a cable wall outlet.
2. Connect
the power adapter to the modem router and plug the power adapter into an
electrical outlet.
The Power LED lights green.
3. On your compute
r or wireless device, find and select the WiFi network.
The WiFi network name is on the product label.
4. Join
the WiFi network and enter the WiFi password.
The password is on the product label.
Your wireless device connects to the WiFi network.
5. Lau
6. Ty
nch a web browser.
pe http://routerlogin.net or http://192.168.0.1.
A login window opens.
rovides to connect the cable port on the
mmends connecting your modem
7. Enter
the modem router user name and password.
The user name is ad
min. The user name and password are case-sensitive.
The BASIC Home page displays.
8. Select AD
9. Select the No radio
VANCED > Administration > Router Mode.
button.
With this setting, the modem router works as a bridge and obtains IP addresses from the cable Internet provider.
10. Click the Appl
y button.
Your change is saved.
11. Fo
llow the instructions that came with your router or gateway to connect it to the modem
router.
Hardware Setup User Manual14
Nighthawk AC1900 WiFi Cable Modem Router

Activate Your Internet Service

To activate your Internet service:
1. Con
2. Check with
tact your Internet provider.
your cable Internet provider to confirm that this modem router is allowed on your
cable network.
This modem router might not be compatible with certain cable networks.
3. If this modem route
r is allowed on your cable network, inform your cable Internet provider
that you are installing a new modem router that you bought from a retail store.
4. Provid
e your cable Internet provider with the modem router’s model number, which is
C6900.
For information about Comcast self-activation
Note: You
can visit your cable Internet provider’s website and follow the
, see Comcast Self-Activation on page 8.
onscreen instructions to activate your Internet service.
Cable ISP Contact Information
Cox
Mediacom https://support.mediacomcable.com
https://www.cox.com/residential/support/home.html https://www.cox.com/activate 1-888-556-1193
1-855-Mediacom (1-855-633-4226)
Optimum https://www.optimum.net/support/contact-us
https://install.optimum.com/JointInstall 1-877-810-6750
Sparklight https://support.sparklight.com
1-877-692-2253
Spectrum https://www.spectrum.net/contact-us
https://activate.spectrum.net 1-833-267-6094
Xfinity
https://www.xfinity.com/internetsetup Use the Xfinity app for Xfinity activation.
Note: Your cable Internet provider’s contact information might change. You
can also find the contact number in your monthly Internet service billing statement.
Hardware Setup User Manual15
Nighthawk AC1900 WiFi Cable Modem Router
MAC address
Serial number
5. When asked, provide the modem router’s serial number and MAC address, which are on the
product label.
6. Wait for your cable Internet provider to confirm that your modem router is active.
you do not get an Internet connection with the modem router, ask your cable Internet
7. If provider to look for your modem router online, then do one of the following depending on what your cable Internet provider tells you about your modem router:
• If the
• If the
modem router is not visible, your cable Internet provider can give you instructions to verify why the modem router does not connect with your high-speed Internet service.
modem router is visible to your cable Internet provider, reboot the modem router. Check your online status again.

Activate Your Internet Service With Comcast Xfinity

If you use Comcast Xfinity, you can set up Internet service by using Comcast Xfinity’s self-activation process. If you are unable to self-activate your modem router, call Comcast Xfinity customer service. After you complete the setup, perform a speed test.
Before you start the self-activation process, make phone number, and login information (your email address or user name and password) are nearby.

Set Up and Activate Your Modem Router With Xfinity

1. If your current modem is leased from Xfinity, call Xfinity support to remove your leased modem from your Xfinity service.
2. Make sure that WiFi network).
3. Open the
4. Fo
llow the steps to get online.
your mobile device is using an LTE Internet connection (do not connect to a
Xfinity app and sign in with your Xfinity ID.
sure that your account number, account
Hardware Setup User Manual16
5. The activation process takes about five minutes.
6. On your mobile device, launch a web browser and enter routerlogin.net or 192.168.0.1 in
the address field.
7. Follow the prompts to:
• Agree to the terms and conditions.
• Change your modem router’s admin credentials and set up security questions.
Review your WiFi network name and password.

Set Up Your Modem Router With Another Cable Internet Service Provider

1. Connect your computer or mobile device to the modem router with WiFi or Ethernet:
WiFi: Use the WiFi network name (SSID) and password on the modem router label to
connect.
Ethernet: Use an Ethernet cable to connect a computer to an Ethernet port on the modem router. (Your computer must have an Ethernet port.)
2. Launch a web browser and enter routerlogin.net or 192.168.0.1 in the address field.
3. Follow the prompts to:
• Agree to the terms and conditions.
• Change your modem router’s admin credentials and set up security questions.
• Review your WiFi network name and password.
Hardware Setup User Manual17
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
• Access the Modem Router with NETGEAR genie App
18

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 Manual19
Nighthawk AC1900 WiFi Cable Modem Router

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:
• WiFi network key or password. Y network name (SSID) and password for wireless access. This information is on the modem router label.
Note: Your modem router
signals. The label shows the SSID for the 2.4 GHz signal. For information about 5 GHz WiFi settings, see on page 49.
• Modem Router login.This log Internet browser.
broadcasts dual-band 2.4 GHz and 5 GHz WiFi
our modem router is preset with a unique wireless
Specify Basic WiFi Settings
s you in to the modem router interface as admin from an

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, the modem router automatically checks to see if it can connect to your Internet service.
To log in to the modem router:
1. Laun
Connect to the Network and Access the Modem Router
ch a web browser from a WiFi-enabled computer or mobile device that is
connected to the network.
User Manual20
Nighthawk AC1900 WiFi Cable Modem Router
2. Type http://routerlogin.net or http://192.168.0.1.
A login window opens.
3. Ente
r the modem router user name and password.
The user name is adm
in. The user name and password are case-sensitive.
The first time you log in to the modem rou
ter, you are prompted to change the admin password and set up security questions. You must enter these settings before you can access the Internet.
4. Enter a new password.
5. Select securit
6. Click the Nex
y questions and enter the answers.
t button.
7. Click the Next button.
The modem router connects to the Internet. The the Internet connection.
Connect to the Network and Access the Modem Router
BASIC Home page displays the status of
User Manual21

Access the Modem Router with NETGEAR genie App

The genie app is the easy dashboard for managing, monitoring, and repairing your home network. The genie app can help you with the following:
• Automatically repair common wireless network problems.
• Easily manage modem router features like Live Parental Controls, guest access, Internet
traffic meter, speed test, and more.
To use the genie app to access the modem router:
1. Visit the NETGEAR genie web page at www.NETGEAR.com/genie.
2. Follow the onscreen instructions to install the app on your smartphone, tablet, or computer.
3. Launch the genie app.
The genie app dashboard page displays:
Connect to the Network and Access the Modem Router
User Manual22
3

3Specify Your Internet Settings

Usually, the quickest way to set up the modem router to use your Internet connection is to allow the genie to detect the Internet connection when you first access the modem router with an Internet browser. You can also customize or specify your Internet settings.
This chapter contains the following sections:
• View Modem Router Initialization
• Manually Set Up the Internet Connection
• Specify an IPv6 Internet Connection
• Change the MTU Size
23
Nighthawk AC1900 WiFi Cable Modem Router

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 provider.
To change the starting frequency:
1. Laun
2. Ty
3. Enter
4. Select Cab
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 window opens.
the modem router user name and password.
The user name is ad
The BASIC Home page displays.
le Connection.
min. The user name and password are case-sensitive.
The page displays the status of all downstream and upstream channels.
the Starting Frequency field, type a number.
5. In
6. Click the Appl
Your settings are saved.
Specify Your Internet Settings User Manual24
y button.
Nighthawk AC1900 WiFi Cable Modem Router

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 th process:
1. Scans
2. Obt
3. Conn
To view the status of the modem router initialization:
1. L
network.
2. T
A login window opens.
3. Ente
The user name is adm
The BASIC Home page displays.
4. Select Cable Connec
and locks the downstream frequency and then ranges the upstream channels.
ains a WAN address for the modem router.
ects to the Internet.
aunch a web browser from a computer or wireless device that is connected to the
ype http://routerlogin.net or http://192.168.0.1.
r the modem router user name and password.
in. The user name and password are case-sensitive.
tion.
e following steps in the provisioning
The Startup Procedure section displays the initialization progress. The page also displays the status of all downstream and upstream channels.(You must scroll down to view all the channels.) The number of downstream and upstream channels that are locked depends on the number of channels that your Internet provider uses.
Specify Your Internet Settings User Manual25
Nighthawk AC1900 WiFi Cable Modem Router
Scroll to view more settings

Manually Set Up the Internet Connection

In most situations, you do not need to change these settings. NETGEAR recommends that you use the default settings for DHCP because most cable Internet services provide the IP address through DHCP.
To specify the Internet connection settings:
1. Laun
2. Ty
3. Enter
4. Select A
ch an Internet browser from a computer or wireless device that is connected to the
network.
pe http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens.
the modem router user name and password.
The user name is ad
The BASIC Home page displays.
DVANCED > Setup > Internet.
min. The user name and password are case-sensitive.
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 page, the defa them.
7. Fo
Specify Your Internet Settings User Manual26
r the Internet IP Address setting, select one of the following radio buttons:
ult settings usually work, but you can change
• Get Dynamically from ISP. Your ISP uses DHCP to assign your IP address. Your ISP
automatically assigns these addresses.
• 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. For the Router MAC Address setting, select one of the following radio buttons:
• Use Default Address. Use the default MAC address.
• Use Computer MAC Address. The modem router captures and uses the MAC
address of the computer that you are now using. You must use the one computer that the ISP allows.
• Use This MAC Address. Enter the MAC address that you want to use.
10. Click the Apply button.
Your settings are saved.
If the NETGEAR website does not display within one minute, see Chapter 8, Troubleshooting.

Specify an IPv6 Internet Connection

To specify an IPv6 Internet connection:
1. Launch an Internet browser from a computer or wireless device that is connected to the
network.
2. Type http://www.routerlogin.net or http://www.routerlogin.com.
A login window opens.
3. Enter the modem router user name and password.
The user name is admin. The user name and password are case-sensitive.
The BASIC Home page displays.
Specify Your Internet Settings User Manual27
Nighthawk AC1900 WiFi Cable Modem Router
4. Select ADVANCED > Advanced Setup > IPv6.
If your Internet provider supports IIPV6, the System Delegated Prefix field displays IPv6 information.
pecify how the modem router assigns IPv6 addresses to the devices on your home
5. S network (the LAN) by selecting one of the following radio buttons:
• Use DHCP Server.
IPv6 systems might not support the DHCv6 client function.
• Auto Config. T
6. Complete
7. Click the Appl
Your settings are saved.
the fields in the Server Settings section.
y button.
This method passes more information to LAN devices, but some
his is the default setting.

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 th changing the value fixes one problem but causes another. Leave the MTU unchanged unless one of these situations occurs:
e default value. In some situations,
ou experience problems connecting to your ISP or other Internet service, and the
• Y technical support of either the ISP or NETGEAR recommends changing the MTU setting. These web-based applications might require an MTU change:
- A secure web
Specify Your Internet Settings User Manual28
site that does not open, or displays only part of a web page
- Yahoo email
Nighthawk AC1900 WiFi Cable Modem Router
- MSN port
- America Onlin
• Y
ou use VPN and have severe performance problems.
ou used a program to optimize MTU for performance reasons, and now you have
• Y
al
e’s DSL service
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:
aunch an Internet browser from a computer or wireless device that is connected to the
1. L network.
ype http://www.routerlogin.net or http://www.routerlogin.com.
2. T
A login window opens.
3. Ente
r the modem router user name and password.
The user name is adm
in. The user name and password are case-sensitive.
The BASIC Home page 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
Specify Your Internet Settings User Manual29
Nighthawk AC1900 WiFi Cable Modem Router
until the problem goes away. The following table describes common MTU sizes and applications.
Table 1. 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. (Larger packets are fragmented.)
1468 Used in some DHCP environments.
PPPoE or VP switches.
N, and is the default value for NETGEAR modem routers, adapters, and
1460 Usable by AOL if you do not have large emai
l attachments, for example.
Specify Your Internet Settings User Manual30
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