NETGEAR CG3300CMR User Manual
Wireless Cable Gateway
CG3300CMR
User Manual
350 East Plumeria Drive
San Jose, CA 95134
USA
September 2012
202-11068-02
v1.0
Wireless Cable Gateway CG3300CMR
© 2012 NETGEAR, Inc. All rights reserved.
No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated
into any language in any form or by any means without the written permission of NETGEAR, Inc.
Tech nic al S upp ort
Thank you for choosing NETGEAR. To register your product, get the latest product updates, or get support online,
visit us at http://support.netgear.com.
Phone (US & Canada only): 1-888-NETGEAR
Phone (Other Countries): See Support information card.
Trademarks
NETGEAR, the NETGEAR logo, and Connect with Innovation are trademarks and/or registered trademarks of
NETGEAR, Inc. and/or its subsidiaries in the United States and/or other countries. Information is subject to change
without notice. Other brand and product names are registered trademarks or trademarks of their respective
holders. © 2012 NETGEAR, Inc. All rights reserved.
Statement of Conditions
To improve internal design, operational function, and/or reliability, NETGEAR reserves the right to make changes
to the products described in this document without notice. NETGEAR does not assume any liability that may occur
due to the use, or application of, the product(s) or circuit layout(s) described herein.
2
Contents
Chapter 1 Connect to the Gateway
Chapter 2 genie Basic Settings
Gateway Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Gateway Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Power Supply Manufacturers and Models . . . . . . . . . . . . . . . . . . . . . . . 10
Gateway Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Log In To Your Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
View the Gateway Home Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Basic Home Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Advanced Home Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Add Wireless Devices or Computers to Your Network. . . . . . . . . . . . . . . . 14
Wireless . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Placement of the Router to Optimize Wireless Connectivity . . . . . . . . . 16
Wireless Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Wireless Screen Fields. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Attached Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Guest Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Guest Network Wireless Security Options . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 3 genie Advanced Home
Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Internet Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Internet Setup Screen Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
WAN Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Default DMZ Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Change the MTU Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
LAN Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
LAN Setup Screen Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Use the Gateway as a DHCP Server . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Address Reservation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Chapter 4 Security
Keyword Blocking of HTTP Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Block Services (Port Filtering) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Security Event Email Notifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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Wireless Cable Gateway CG3300CMR
Chapter 5 Administration
View Gateway Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Router Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Cable Network Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Wireless Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Guest Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
View Logs of Web Access or Attempted Web Access . . . . . . . . . . . . . . . . 47
View Event Logs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Manage the Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Back Up Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Restore Configuration Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Set Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Chapter 6 Advanced Settings
Advanced Wireless Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Advanced Wireless Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Wireless Card Access List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Nearby Wireless Access Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Port Forwarding and Port Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Remote Computer Access Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Port Triggering to Open Incoming Ports . . . . . . . . . . . . . . . . . . . . . . . . . 60
Port Forwarding to Permit External Host Communications . . . . . . . . . . 61
How Port Forwarding Differs from Port Triggering . . . . . . . . . . . . . . . . . 63
Set Up Port Forwarding to Local Servers. . . . . . . . . . . . . . . . . . . . . . . . . . 63
Add a Custom Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Edite or Delete a Port Forwarding Entry. . . . . . . . . . . . . . . . . . . . . . . . . 65
Set Up Port Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Dynamic DNS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Cable Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Universal Plug and Play . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
NAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Chapter 7 Troubleshooting
Basic Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Using LEDs to Troubleshoot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Connect to the Main Menu of the Gateway . . . . . . . . . . . . . . . . . . . . . . . . 75
Troubleshoot the ISP Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Troubleshoot a TCP/IP Network Using a Ping Utility . . . . . . . . . . . . . . . . . 76
Test the LAN Path to Your Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Test the Path from Your Computer to a Remote Device . . . . . . . . . . . . 77
Wireless Performance and Gateway Location . . . . . . . . . . . . . . . . . . . . . . 78
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Wireless Cable Gateway CG3300CMR
Appendix A Supplemental Information
Factory Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Appendix B Notification of Compliance
Index
5
1. Connect to the Gateway
Getting to know your gateway
1
This chapter describes how to configure the Internet connection of your gateway and includes
these sections:
• Gateway Front Panel
• Gateway Rear Panel
• Gateway Label
• Log In To Your Gateway
• View the Gateway Home Screens
• Add Wireless Devices or Computers to Your Network
Note: For more information about the topics that are covered in this
manual, visit the support website at support.netgear.com.
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Wireless Cable Gateway CG3300CMR
Power
Downstream
Upstream
Internet
LAN (Ethernet)
WPS
Wireless On/Off
Gateway Front Panel
Note: For optimal performance, place the gateway vertically in the stand.
Do not mount this unit to a wall; it is not suitable for wall mounting.
Connect to the Gateway
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Wireless Cable Gateway CG3300CMR
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 gateway.
LED Description
• Green. Pow
• Blin
Power
Downstream
Upstream
Internet
Ethernet)
LAN (
Button Description
• Off. No powe
• Green. More
• Am
• Blin
• Off. No down
• Green. More than one channel is locked (channel bonding).
• Am
• Blin
• Off. No up
• So
• Blin
• Off. The cable modem is offline.
Green indicates 1,000 Mbps. Amber indicates 100/10 Mbps.
• Solid.
• Blin
• Off. No Ethernet device is detected on the Ethernet port.
Pressing this button opens a 2-minute windo
WPS-enabled devices.
king. Power-on self-test.
ber. One channel is locked (no channel bonding).
king. The unit is scanning for a downstream channel.
ber. One channel is locked (no channel bonding).
king. The unit is scanning for an upstream channel.
lid green. The cable modem is online.
king. The cable modem is synchronizing with the CMTS of the cable provider.
king. Data is being transmitted or received on the Ethernet port.
er is supplied to the cable modem.
r.
than one channel is locked (channel bonding).
stream channel is locked.
stream channel is locked.
An Ethernet device is connected and powered on.
w for the gateway to connect with other
WPS
Wireless On/Off
Note: W
Turn the wireless radio in the gateway on and of
LED located below this button indicates if the wireless radio is on or off.
Note: W
PS has been disabled.
f. The wireless radio is on by default. The
ireless On/Off button has been disabled.
Connect to the Gateway
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Wireless Cable Gateway CG3300CMR
Power
Ethernet LAN ports
Coaxial
adapter
input
cable
connector
Power On/Off
button
Restore Factory
Settings
button
Gateway Rear Panel
The rear panel includes the following connections when viewed from top to bottom:
wo Gigabit Ethernet LAN ports. Use these ports to connect local computers.
• T
• Res
tore Factory Settings button. You can return the gateway to its factory settings.
Press and hold the Restore Factory Settings button for over 7 seconds. The gateway
resets and returns to its factory settings. See Factory Default Settings on p
• Coax
ial cable connector. Attach a coaxial cable to the cable service provider connection.
• Power adapter input. Conne
• Power On/Off button. Press to
ct the power adapter unit here.
turn on power. Press again to turn off power.
Connect to the Gateway
9
age 79.
Wireless Cable Gateway CG3300CMR
Designed by NETGEAR in California
MAC address Serial number
Preset WiFi password
Default access information
Preset SSID
Security PIN
Power Supply Manufacturers and Models
Note: Use only power supplies listed in the User Manual.
• Adaptor of CWT
Manufacturer: Channel Well Technology Co Ltd
Model: SAL018F2
• Adapto
r of PI
Manufacturer: PI Electronics (H.K.) Ltd.
Model: AD817000
Gateway Label
The label on the bottom of the gateway shows the WPS PIN, login information, MAC address,
and serial number.
Connect to the Gateway
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Wireless Cable Gateway CG3300CMR
Log In To Your Gateway
You can log in to the gateway to view or change its settings.
Note: To connect to the gateway, use a computer that is configured for
DHCP (most computers are). For help with configuring DHCP, see
the instructions that came with your computer.
The gateway automatically logs you out after 5 minutes of no activity.
To log in to the gateway:
1. On the
computer that is connected to the gateway with an Ethernet cable, type
http://192.168.1.1 in the address field of your Internet browser.
A login window opens.
2. Log in with the user name admin and its default password of password.
The gateway Basic Home screen displays when you log in (see Basic Home Screen on
page 12).
Connect to the Gateway
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Wireless Cable Gateway CG3300CMR
Language
Menus (Click the Advanced tab to view more)
Dashboard (Click to view details)
View the Gateway Home Screens
The gateway home screens include a Basic Home screen and an Advanced Home screen.
Basic Home Screen
When you connect to the gateway, the gateway dashboard (Basic Home screen) displays.
The gateway Basic Home screen has a dashboard that lets you see the status of your
Internet connection and network at a glance. You can click any of the sections of the
dashboard to view more detailed information. The left column has the menus, and at the top
there is an Advanced tab that is used to access additional menus and screens.
• Home. Th
Home tab.
• W
ireless. View or change the wireless settings for your gateway.
• Att
ached Devices. View the devices that are connected to your network.
is dashboard screen displays when you log in to the gateway or select the
Connect to the Gateway
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Wireless Cable Gateway CG3300CMR
• Guest Network. Set up a guest network to allow visitors to use the Internet connection of
your gateway.
• Adv
anced tab. Set the gateway up for unique situations such as when remote access by
IP or by domain name from the Internet is needed. See Advanced Home Screen on
page 13. Using this tab requires a solid understanding of networking concepts.
For more information about the Basic settings, see Chapter 2, genie Basic Settings.
Advanced Home Screen
Note: Using the Advanced Home screen requires a solid understanding of
networking concepts.
To view the Advance Home screen, select the Advanced tab from the top menu.
The gateway Advanced Home screen has a dashboard that lets you see the configuration of
your gateway and network at a glance. You can click any of the sections of the dashboard to
view more detailed information. The left column has the menus, and at the top there is a
Basic tab that is used to the basic menus and screens.
• Adv
anced Home. This dashboard screen displays when you select the Advanced tab.
Connect to the Gateway
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Wireless Cable Gateway CG3300CMR
• Setup. Set up the Internet connection, wireless, guest network, WAN, and LAN.
• Security. Block sites, block services, and set up email notifications.
• Administration. View router status, logs, and event logs, back up and restore the
configuration file, and change the gateway password.
• Advanced Setup. Configure advanced network features such as port forwarding, port
triggering, Dynamic DNS, UPnP, and IPv6.
• Home tab. Return to the Basic Home screen. See Basic Home Screen on page 12.
For more information about the Advanced settings, see Chapter 3, genie Advanced Home.
Add Wireless Devices or Computers to Your Network
See Guest Networks on page 20 for instructions on how to set up a guest network.
To add wireless devices or computers to your network:
1. Open the software that manages your wireless connections on the wireless device
(laptop computer, gaming device, iPhone) that you want to connect to your gateway.
This software scans for all wireless networks in your area.
2. Look for your network and select it. If you did not change the name of your network during
the setup process, look for the default WiFi network name (SSID) and select it. The default
SSID is on the product label on the bottom of the gateway.
3. Enter the gateway password and click Connect. The default gateway passphrase is on the
product label on the bottom of the gateway.
4. Repeat steps 1–3 to add other wireless devices.
Connect to the Gateway
14
2. genie Basic Settings
Your Internet connection and network
2
This chapter explains the features available from the genie Basic Home screen that is shown in
the following figure:
This chapter contains the following sections:
• Wireless
• Attached Devices
• Guest Networks
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Wireless Cable Gateway CG3300CMR
Wireless
Note: To ensure proper agency compliance and compatibility between
similar products in your area, set the operating channel and region
correctly.
Placement of the Router to Optimize Wireless Connectivity
The operating distance or range of your wireless connection can vary based on the physical
placement of the router. For best results, place your router:
• Near the center of the area in which your computers operate.
• In an elevated location such as a high shelf.
• Away from potential sources of interference, such as computers, microwave ovens, and
cordless phones.
• Away from large metal surfaces.
Note: Failure to follow these guidelines can result in significant
performance degradation or inability to connect wirelessly to the
gateway.
Wireless Screen
The Wireless screen lets you view or configure the wireless network setup.
The wireless cable gateway comes with preset security. This feature 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 bottom of the unit.
Note: The preset SSID and password are uniquely generated for every
device to protect and maximize your wireless security.
NETGEAR recommends that you do not change your preset security settings. If you do
decide to change your preset security settings, make a note of the new settings and store it in
a safe place.
If you use a wireless computer to change the wireless network name (SSID) or other wireless
security settings, you are disconnected when you click Apply. To avoid this problem, use a
computer with a wired connection to access the gateway.
genie Basic Settings
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Wireless Cable Gateway CG3300CMR
To view or change basic wireless settings:
1. On the Basic Home screen, select Wireless to display the Wireless screen.
The screen sections, settings, and procedures are
2. Chan
3. Set up and
ge what you need to, and click Apply to save your settings.
test your wireless devices and computers to make sure that they can connect
wirelessly. If they do not, check the following:
s your wireless device or computer connected to your network or another wireless
• I
network in your area? Some wireless devices automatically connect to the first open
network (without wireless security) that they discover.
• Doe
s your wireless device or computer show up on the Attached Devices screen? If it
does, then it is connected to the network.
• I
f you are not sure what the network name (SSID) or password is, look on the label on
the bottom of your gateway.
genie Basic Settings
explained in the following sections.
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Wireless Cable Gateway CG3300CMR
CAUTION:
Wireless Screen Fields
Wireless Network
• Enable SSID Broadcast. This setting allows the gateway to broadcast its SSID so
wireless stations can see this wireless name (SSID) in their scanned network lists. This
check box is selected by default. To turn off the SSID broadcast, clear the Enable SSID
Broadcast check box, and click Apply.
• Enable W
or wireless devices) that join the network can use the Internet. They cannot access each
other or access Ethernet devices on the network, however.
• Name (SSID). The
32-character (maximum) name in this field. This field is case-sensitive. The default SSID
is randomly generated, and NETGEAR strongly recommends that you do not change
the SSID.
• Region. T
ireless Isolation. If this check box is selected, then wireless clients (computers
SSID is also known as the wireless network name. Enter a
he location where the gateway is used.
• Channel.
from 1 through 13. (For products in the North America market, only Channels 1 through
11 can be operated.) Do not change the channel unless you experience interference
(such as lost connections or slow data transfers). If any interference happens, experiment
with different channels to see which is the best.
• Mod
join the network. g & b supports up to 54 Mbps. The 300 Mbps setting allows 802.11n
devices to connect at this speed.
This setting is the wireless channel that the gateway uses. Choose a value
e. Up to 145 Mbps is the default and allows 802.11n and 802.11g wireless devices to
Security Options Settings
The Security Options section of the Wireless screen lets you change the security option and
passphrase. NETGEAR recommends that you do not change the security option or
passphrase, but if you want to change these settings, this section explains how.
Do not disable security.
To change the WPA security option and passphrase:
1. Under Security Options, select th
e WPA option that you want.
2. In the Passphrase field that displays when you select a WPA security option, enter the
network key (passphrase) that you want to use. It is a text string from 8 to 63 characters.
genie Basic Settings
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Wireless Cable Gateway CG3300CMR
Attached Devices
You can view all computers or devices that are currently connected to your network here.
From the Basic Home screen, select Attached Devices to display the following screen:
Wired devices are connected to the gateway with Ethernet cables. Wireless devices have
joined the wireless network.
• IP
Address. The IP address that the gateway assigned to this device when it joined the
network. This number can change when a device disconnects and then rejoins the
network.
• Device Name. If the
You can click Re
fresh to update this screen.
device name is known, it is shown here.
genie Basic Settings
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Wireless Cable Gateway CG3300CMR
Guest Networks
You can add a guest network to allow visitors at your home to use the Internet without
providing them with your wireless security key.
To set up a guest network:
1. Select Basic > Guest Network to displa
y the following screen:
2. Select any of the following wireless se
Enable Guest Network. W
and guests can connect to your network using the SSID of this profile.
Enable SSID Broadcast. If th
broadcasts its name (SSID) to all wireless stations. Stations with no SSID can adopt the
correct SSID for connections to this access point.
• Enable W
ireless Isolation. If this check box is selected, then wireless clients (computers
or wireless devices) that join the network can use the Internet. They cannot access each
other or access Ethernet devices on the network, however.
3. Give the guest net
work a name.
ttings:
hen this check box is selected, the guest network is enabled,
is check box is selected, the wireless access point
genie Basic Settings
20
Wireless Cable Gateway CG3300CMR
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 nonguest SSID.
4. Select the guest network group from the list.
5. Select a security option from the list. The security options are described in Guest Network
Wireless Security Options on page 21.
6. Click Apply to save your selections.
Guest Network Wireless Security Options
A security option is the type of security protocol that is applied to your wireless network. The
security protocol in force encrypts data transmissions and ensures that only trusted devices
receive authorization to connect to your network.
This section presents an overview of the security options and provides guidance on when to
use which option. It is also possible to set up a guest network without wireless security.
NETGEAR does not recommend not using wireless security.
Wi-Fi Protected Access (WPA) encryption is built into all hardware that has the Wi-Fi-certified
seal. This seal means that the product complies with the worldwide single standard for
high-speed wireless local area networking that the Wi-Fi Alliance (http://www.wi-fi.org/)
established.
WPA-PSK uses a passphrase to perform authentication and generate the initial data
encryption keys. Then it dynamically varies the encryption key. WPA-PSK uses Temporal Key
Integrity Protocol (TKIP) data encryption and implements most of the IEEE 802.11i standard.
It is designed to work with all wireless network interface cards. Not all wireless access points
work with this standard. WPA2-PSK supersedes WPA-PSK.
WPA2-PSK is stronger than WPA. It is advertised to be theoretically indecipherable due to
the greater degree of randomness in encryption keys that it generates. WPA2-PSK gets
higher speed because it is implemented through hardware, while WPA-PSK is implemented
through software. WPA2-PSK uses a passphrase to authenticate and generate the initial data
encryption keys. Then it dynamically varies the encryption key.
WPA-PSK + WPA2-PSK Mixed Mode can provide broader support for all wireless clients.
WPA2-PSK clients get higher speed and security, and WPA-PSK clients get decent speed
and security. The product documentation for your wireless adapter and WPA client software
has instructions about configuring their WPA settings.
genie Basic Settings
21
3. genie Advanced Home
Specifying custom settings
This chapter explains the features available from the genie Advanced Home screen that is
shown in the following figure:
3
This chapter contains the following sections:
• Setup Menu
• WAN Setup
• LAN Setup
Some selections on the Advanced Home screen
• Se
curity. See Chapter 4, Security.
are described in separate chapters:
22
Wireless Cable Gateway CG3300CMR
• Administration. See Chapter 5, Administration.
• Advanced Setup. See Chapter 6, Advanced Settings.
Setup Menu
Select Advanced > Setup to display the Setup menu. The following selections are available:
• Internet Setup. See Internet Setup on page 24.
• Wireless Setup. This menu item is a shortcut to the same Wireless screen that you can
access from the dashboard on the Basic Home screen. See
• Guest Network. This menu item is a shortcut to the same Guest Network screen that you
can access from the dashboard on the Basic Home screen. See
page 20.
• WAN Setup. Internet wide area network (WAN) setup. See WAN Setup on page 26.
• LAN Setup. Local area network (LAN) setup. See LAN Setup on page 28.
Wireless on page 16.
Guest Networks on
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Internet Setup
The Internet Setup screen is where you view or change ISP information.
To change the Internet settings:
1. From the Adva
displays:
nced Home screen, select Setup > Internet. The following screen
2. Enter the settings for the IP address and DNS server. The default settings usually work fine.
If you have problems with your connection, check the ISP settings.
3. Click Apply to save
your settings.
Internet Setup Screen Fields
The following descriptions explain all of the possible fields in the Internet Setup screen.
Internet IP Address.
• If you lo
router finds an IP address for you automatically when you connect. Select Get
Dynamically from ISP.
g in to your service or your ISP did not provide you with a fixed IP address, the
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• If you have a fixed (or static) IP address, your ISP has provided you with the required
information. Select Use Stat ic IP Address and type the IP address, IP subnet mask, and
gateway IP address in the correct fields.
For example:
- IP Address. 24.218.156.183
- Subnet Mask. 255.255.255.0
- Gateway IP Address. 24.218.156.1
Domain Name Server (DNS) Address. The DNS server is used to look up site addresses
that are based on their names.
• If your ISP gave you one or two DNS addresses, select Use These DNS Servers and
type the primary and secondary addresses.
• Otherwise, select Get Automatically from ISP.
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.
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WAN Setup
The WAN Setup screen lets you configure a DMZ (demilitarized zone) server, change the
maximum transmit unit (MTU) size, and enable the gateway to respond to a ping on the WAN
(Internet) port.
To change the WAN settings:
Select Advanc
ed > Setup > WAN Setup to view the following screen:
• Default DMZ Server. This feature is sometimes helpful when you are playing online
games or videoconferencing. Be careful when using this feature because it makes the
firewall security less effective. See Default DMZ Server on
• Respond
to Ping on Internet Port. If you want the gateway to respond to a ping from
the Internet, select this check box. Use this feature only as a diagnostic tool because it
also allows your gateway to be discovered. Do not select this check box unless you have
a specific reason.
• MTU Size (in by
tes). The normal MTU (maximum transmit unit) value for most Ethernet
networks is 1500 bytes, or 1492 bytes for PPPoE connections. For some ISPs, reduce
the MTU. Reducing the MTU size is rarely required, and you should not do this unless
you are sure that it is necessary for your ISP connection. See Change the MTU Size on
page 27.
page 27 for more details.
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WARNING:
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 gateway is programmed to recognize some of these applications and to work
correctly with them, but there are other applications that do not function well. In some cases,
one local computer can run the application correctly if the IP address of that computer is
entered as the default DMZ server.
DMZ servers pose a security risk. A computer that is 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 gateway discards incoming traffic from the Internet unless the traffic is 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 it forwarded to one
computer on your network. This computer is called the default DMZ server.
To set up a default DMZ server:
1. On the WAN Setup screen, select the Default DMZ Server check box.
2. Type the IP address.
3. Click Apply.
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 any device in the data path has a lower MTU
setting than the other devices, the data packets are split (or “fragmented”) to accommodate
the device that has the smallest MTU.
The best MTU setting for NETGEAR equipment is often the default value, and changing the
value often fixes one problem but causes another. Leave MTU size unchanged unless one of
these situations occurs:
• You have 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 often 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 DSL service
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