NETGEAR CG3100Dv3 User manual

350 East Plumeria Drive
San Jose, CA 95134
USA
October 2011
202-10942-01
v1.0
Wireless Cable Gateway
CG3100Dv3
User Manual

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NETGEAR Wireless Cable Gateway CG3100Dv3
© 2011 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.
Technical Support
Thank you for choosing NETGEAR. To register your product, get the latest product updates, get support online, or
for more information about the topics covered in this manual, visit the Support website at
http://support.netgear.com.
Phone (US & Canada only): 1-888-NETGEAR
Phone (Other Countries): Check the list of phone numbers at
http://support.netgear.com/app/answers/detail/a_id/984
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. © 2011 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.
Revision History
Publication Part Number Version Publish Date Comments
202-10942-01 v1.0 October 2011 First publication

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Table of Contents
Chapter 1 Connecting to the Internet
Gateway Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Gateway Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Logging Into Your Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Viewing the Basic Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Chapter 2 Wireless Configuration
Setting Up Your Wireless Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Manually Configuring Wireless Settings. . . . . . . . . . . . . . . . . . . . . . . . . . .13
WPA or WPA2 Wireless Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
WEP Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Using Push 'N' Connect (WPS) Wireless Setup. . . . . . . . . . . . . . . . . . . . .15
Using the WPS Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Using a PIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Wi-Fi Multimedia. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Advanced Wireless Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Start Configure Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Access Control by MAC Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Chapter 3 Content Filtering
Viewing or Emailing Logs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Blocking Keywords, Sites, and Services . . . . . . . . . . . . . . . . . . . . . . . . . .22
Blocking Keywords and Domains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Chapter 4 Managing Your Network
Viewing the Gateway Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Viewing the Connection Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Changing Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Backing Up and Restoring Your Settings. . . . . . . . . . . . . . . . . . . . . . . . . .28
Viewing the Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Running the Diagnostic Ping Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Chapter 5 Advanced Settings
MAC Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Port Blocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Port Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

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NETGEAR Wireless Cable Gateway CG3100Dv3
Considerations for Port Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Port Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
DMZ Host. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
LAN IP Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Reserving an IP Address for DHCP Use . . . . . . . . . . . . . . . . . . . . . . . .38
Remote Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Configuring Universal Plug and Play (UPnP). . . . . . . . . . . . . . . . . . . . . . .41
Chapter 6 Troubleshooting
Basic Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Using LEDs to Troubleshoot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Connecting to the Gateway’s Main Menu. . . . . . . . . . . . . . . . . . . . . . . . . .44
Troubleshooting the ISP Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Troubleshooting a TCP/IP Network Using a Ping Utility. . . . . . . . . . . . . . .45
Testing the LAN Path to Your Gateway . . . . . . . . . . . . . . . . . . . . . . . . .46
Testing the Path from Your PC to a Remote Device . . . . . . . . . . . . . . .46
Wireless Performance and Gateway Location. . . . . . . . . . . . . . . . . . . . . .47
Appendix A Default Settings and Technical Specifications
Factory Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Appendix B Notification of Compliance
Index

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1. Connecting to the Internet
For help installing the gateway, see the Wireless Cable Gateway CG3100Dv3 Quick Install
Guide.
This chapter describes how to configure your gateway’s Internet connection and includes these
sections:
• Gateway Front Panel on page 6.
• Gateway Rear Panel on page 8.
• Logging Into Your Gateway on page 9.
• Viewing the Basic Settings on page 10.
Note: For more information on the topics covered in this manual, visit the
support website at http://support.netgear.com.

Connecting to the Internet
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NETGEAR Wireless Cable Gateway CG3100Dv3
Gateway Front Panel
Power
Downstream
Upstream
Internet
LAN (Ethernet)
WPS
Wireless On/Off
Figure 1. Gateway front view
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.

Connecting to the Internet
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NETGEAR Wireless Cable Gateway CG3100Dv3
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
Power
• Green: Power is supplied to the cable modem.
• Blinking: Power on self-test.
• Off: No power.
Downstream
• Green: One or more downstream channels is locked.
• Blinking: The unit is scanning for a downstream channel.
• Off: No downstream channel is locked.
Upstream
• Green: One or more upstream channels is locked.
• Blinking: The unit is scanning for an upstream channel.
• Off: No upstream channel is locked.
Internet
• Solid green: The cable modem is online.
• Blinking: The cable modem is synchronizing with the cable provider’s CMTS.
• Off: The cable modem is offline.
LAN (Ethernet)
Green indicates 1,000 Mbps. Amber indicates 100/10 Mbps.
• Solid: An Ethernet device is connected and powered on.
• Blinking: Data is being transmitted or received on the Ethernet port.
• Off: No Ethernet device is detected on the Ethernet port.
Button Description
WPS
Pushing this button opens a 2-minute window for the gateway to connect with other
WPS-enabled devices. For more information, about using the WPS method to implement
security, see the Using Push 'N' Connect (WPS) Wireless Setup on page 15
Wireless
On/Off
Turn the wireless radio in the gateway on and off. The wireless radio is on by default. The
LED located below this button indicates if the wireless radio is on or off.

Connecting to the Internet
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NETGEAR Wireless Cable Gateway CG3100Dv3
Gateway Rear Panel
Power
Ethernet LAN ports
Coaxial
adapter
input
cable
connector
Power On/Off
button
Restore Factory
Settings
button
Figure 2. Gateway rear panel
The rear panel includes the following connections, viewed from left to right:
• Four Gigabit-Ethernet LAN ports: Use these ports to connect local computers.
• Coaxial cable connector: Attach coaxial cable to the cable service provider’s connection.
• Power: Power adapter input.

Connecting to the Internet
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NETGEAR Wireless Cable Gateway CG3100Dv3
• Power On/Off button.
Note: You can return the gateway to its factory settings. On the back panel
of the gateway, 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 in Appendix A.
Logging Into Your Gateway
You can log in to the gateway to view or change its settings. Links to Knowledge Base and
documentation are also available on the gateway main menu.
Note: To connect to the gateway you must use a computer configured for
DHCP (most computers are). For help with configuring DHCP, see
the instructions that came with your computer.
When you have logged in, if you do not click Logout, the gateway waits for 5 minutes after no
activity before it automatically logs you out.
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.
When you connect to the gateway the Gateway Status screen displays.

Connecting to the Internet
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NETGEAR Wireless Cable Gateway CG3100Dv3
To view the gateway’s settings for the Internet connection, see the following section,
Viewing the Basic Settings on page 10.
Viewing the Basic Settings
The Basic Settings screen shows the Internet settings for the gateway.
To view or configure the basic settings:
1. Select Basic Settings from the main menu.
2. You can fill in the Domain Name and Device Name fields.
• By default, the Dynamic IP radio button is selected. This allows the gateway to
download network configuration from your ISP.