SMC Networks SMCD3GNV3 User manual

SMCD3GNV3 User Manual
Comcast
Wireless Cable Modem Gateway
FastFind Links
Getting to Know the Gateway
Installing the Gateway
Preconfiguration Guidelines
Configuring the Gateway
Configuring the Gateway’s mso Interface

SMC Networks
20 Mason
Irvine, CA. 92618
U.S.A.
Copyright © 2012 SMC Networks
All Rights Reserved
Information furnished by SMC Networks, Inc. (SMC) is believed to be accurate and reliable. However,
no responsibility is assumed by SMC for its use, or for any infringements of patents or other rights of
third parties which may result from its use. No license is granted by implication or otherwise under
any patent or patent rights of SMC. SMC reserves the right to change specifications at any time
without notice
No part of this publication may be reproduced or transmitted in any form or by any means, electronic
or mechanical, including photocopying and recording, or stored in a database or retrieval system for
any purpose without the express written permission of SMC.
Microsoft and Windows are registered trademarks of Microsoft Corporation. Apple and Macintosh are
registered trademarks of Apple, Inc. All other brands, product names, trademarks, or service marks
are property of their respective owners.
This product (Model :SMCD3GNV3) includes software code developed by third parties, including
software code subject to the GNU General Public License (“GPL”) or GNU Lesser General Public
License (LGPL”). As applicable, the terms of the GPL and LGPL, and information on obtaining access
to the GPL code and LGPL used in this product, are available to you at http://gpl.smc.com/. The GPL
code and LGPL code used in this product is distributed WITHOUT ANY WARRANTY and is subject to
the copyrights of one or more authors. For details, see the GPL Code and LGPL Code for this product
and the terms of the GPL and LGPL.
SMCD3GNV3 Wireless Cable Modem Gateway User Manual
November 20, 20122

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SMCD3GNVWireless Cable Modem Gateway User Manual
Contents
Preface ..................................................................................................................................vii
Key Features...............................................................................................................viii
Document Organization................................................................................................ix
Document Conventions.................................................................................................ix
Safety andWarnings...............................................................................................ix
Typographic Conventions..............................................................................................x
1 Getting to Know the Gateway......................................................................................11
Unpacking Package Contents ....................................................................................12
System Requirements.................................................................................................12
Front Panel..................................................................................................................13
Rear Panel ..................................................................................................................15
Top Panel....................................................................................................................16
BottomPanel...............................................................................................................16
Using the Reset Button...............................................................................................17
2 Installing the Gateway...................................................................................................18
Finding a Suitable Location.........................................................................................19
Installing a Battery.......................................................................................................20
Connecting to the LAN................................................................................................21
Connecting the WAN...................................................................................................22
Connecting to the Public Telephone Network............................................................22
Powering on the Gateway...........................................................................................23
3 Preconfiguration Guidelines........................................................................................24
Configuring Your Computer for TCP/IP......................................................................25
Configuring Microsoft Windows 2000...................................................................25
Configuring Microsoft Windows XP ......................................................................26
Configuring Microsoft Windows Vista...................................................................27
Configuring Microsoft Windows 7.........................................................................30
Configuring an Apple
®
Macintosh
®
Computer ......................................................33
Disabling Proxy Settings.............................................................................................34
Disabling Proxy Settings in Internet Explorer.......................................................34
Disabling Proxy Settings in Firefox.......................................................................34
Disabling Proxy Settings in Safari.........................................................................35
Disabling Firewall and Security Software...................................................................35
Confirming the Gateway’s Online Status....................................................................35

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SMCD3GNV Wireless Cable ModemGateway User Manual
Confirming Your Computer’s Link Status ...................................................................35
4 Configuring the Gateway..............................................................................................36
Accessing the Gateway’s Web Management.............................................................37
Understanding the Web Management Interface Menus ............................................38
Web Management Interface Menus ...........................................................................40
ViewingInformation About Your Network and Connected Devices.....................42
ViewingInformation About Your Network and Connections ................................43
Viewingthe Gateway’s Connection Status.....................................................44
Viewing Comcast NetworkInformation...........................................................46
Viewingand Editing Your Local IP Configuration...........................................47
Viewingand EditingWireless Configuration...................................................49
Configuring Firewall Settings................................................................................53
Viewing SystemSoftware Settings.......................................................................55
Configuring System Hardware..............................................................................56
Viewing System Hardware Settings ...............................................................56
Viewing Battery Settings.................................................................................57
ViewingLAN Ethernet Settings.......................................................................58
ViewingWi-Fi Settings....................................................................................59
Configuring Your Home Network..........................................................................60
Working with Connected Devices.........................................................................64
Manually Adding Computers with Static IP Addresses to the Wireless
Network..............................................................................................65
Configuring Parental Controls...............................................................................68
Blocking Sites and Keywords, and Selecting Trusted Computers.................68
Blocking Services............................................................................................75
Managing Devices and Access Types............................................................78
Generating Reports.........................................................................................82
Using Advanced Features.....................................................................................84
Enabling or Disabling Port Forwarding...........................................................84
Enabling or Disabling Port Triggering.............................................................87
Enabling or Disabling Port Blocking ...............................................................91
Discovering Devices........................................................................................92
Troubleshooting the Gateway...............................................................................94
Defining Log Filters.........................................................................................94
Testing Connectivity to Destination and IP Addresses ..................................96
Restoring or Rebootingthe Gateway .............................................................98
Changing the Login Password........................................................................99
5 Configuring the Gateway’s mso Interface..............................................................100
Accessing the Gateway’s Web Management...........................................................101
Understanding the Web Management Interface Menus ..........................................102

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SMCD3GNV Wireless Cable ModemGateway User Manual
Web Management Interface Menus .........................................................................104
Configuring the Gateway Settings......................................................................106
Viewing At-a-Glance Configuration Settings ................................................107
Configuring Email Notifications.....................................................................108
Configuring Connections.....................................................................................110
Viewingthe Gateway’s Connection Status...................................................111
Viewingand Editing Your Local IP Configuration.........................................112
Viewingand EditingWireless Configuration.................................................114
Viewing XFINITY Network Information.........................................................121
Configuring Firewall Settings..............................................................................123
Viewing SystemSoftware Settings.....................................................................125
Configuring Hardware.........................................................................................126
Viewing System Hardware Settings .............................................................127
Viewing Battery Settings...............................................................................128
ViewingLAN Ethernet Settings.....................................................................129
ViewingWi-Fi Settings..................................................................................130
Configuring Your Home Network........................................................................131
Working with Connected Devices.......................................................................135
Manually Adding Computers with Static IP Addresses ................................136
Manually Adding Wireless Clients ................................................................139
Configuring Parental Controls.............................................................................142
Blocking Sites and Keywords, and Selecting Trusted Computers...............142
Blocking Services and Selecting Trusted Computers..................................148
Managing Devices and Access Types.......................................................... 152
Generating Reports.......................................................................................156
Using Advanced Features...................................................................................157
Enabling or Disabling Port Forwarding.........................................................157
Enabling or Disabling Port Triggering...........................................................160
Remote Management ...................................................................................163
Configuring DMZ Settings.............................................................................165
Configuring Routing Settings........................................................................167
Configuring Dynamic DNS Settings..............................................................169
Discovering Devices......................................................................................171
Troubleshooting the Gateway.............................................................................173
Generating Logs............................................................................................174
Testing Connectivity to Destination and IP Addresses ................................175
Restoring or Rebootingthe Gateway ...........................................................177
Changing the Login Password......................................................................178
6 Troubleshooting Procedures.....................................................................................179
Basic Troubleshooting Procedures...........................................................................180
Advanced Troubleshooting Procedures ...................................................................182

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SMCD3GNV Wireless Cable ModemGateway User Manual
Troubleshooting Physical NetworkProblems.....................................................182
Troubleshooting Configuration Problems...........................................................183
Determining Your IP Address .......................................................................183
Troubleshooting Software-Interaction Problems................................................187
Specific Troubleshooting Procedures.......................................................................188
Unable to Log In to Gateway ..............................................................................188
Local Networked Devices Unable to Access the Gateway ................................188
Unable to Access the Internet.............................................................................189
Unable to Access Networked Devices................................................................191
Using the Ping Utility to Troubleshoot ................................................................191
Testingthe Path from a Computer to the Gateway...................................... 191
Testingthe Path from a Computer to the Internet........................................192
Using Ping on a Macintosh...........................................................................193
Gateway Disconnects fromthe Internet .............................................................194
SlowWeb Browsing............................................................................................195
Unable to Configure Port Forwarding.................................................................195
Unable to Use Pass-thru VPN............................................................................195
Gateway is Not Passing DHCP Address to a computer.....................................195
Determining a Computer’s MAC Address...........................................................196
Microsoft Windows........................................................................................196
Apple Macintosh Windows OS X..................................................................197
Wireless Troubleshooting .........................................................................................198
Checking the Gateway’s Wireless Connection...................................................198
Wireless Range is Low.......................................................................................198
Unable to Connect to a Wireless Network Using Windows XP and Vista.........199
Achieving OptimalWireless Performance..........................................................201
Guidelines for Improving Your Wireless Network...............................................201
Wireless IEEE 802.11n Guidelines.....................................................................202
Application and Gaming Troubleshooting.................................................................204
Connecting to Messenger Services Behind the Gateway.................................. 204
Connecting to America Online Behind the Gateway..........................................204
Connecting to XBox Live, PSP, and Nintendo WFC..........................................204
Appendix A - Specifications..........................................................錯誤! 尚未定義書籤。
Appendix B - Compliances............................................................錯誤! 尚未定義書籤。
Index ....................................................................................................................................207

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SMCD3GNVWireless Cable Modem Gateway User Manual
Preface
The SMCD3GNV3 Wireless Cable Modem Gateway is the ideal all-in-one wiredand
wireless solution for the home or business environment. SMCis proud to provide you witha
powerful, yet simple communication device for connecting your local-area network (LAN) to
the Internet.
This user manualcontains all the information you needto install and configure your new
SMCD3GNV3 Wireless Cable Modem Gateway.

Preface
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SMCD3GNV Wireless Cable ModemGateway User Manual
Key Features
The following list summarizes the Gateway’s key features.
 Integrated, CableLabs-compliant DOCSIS 1.1/ 2.0 /3.0 cable modem.
 Integrated cable modem port for Internet connection to cable modem service.
 Four 10/100/1000 Mbps Auto-Sensing LAN ports with Auto-MDI/MDIX.
 High-speed 300 Mbps IEEE 802.11n Wireless Access Point.
 Dynamic Host Configuration Protocol(DHCP) for dynamic IP configuration, and Domain
Name System (DNS) for domain name mapping.
 One USB 2.0 port.
 Two Plain Old Telephone System (POTS) RJ-11 telephone ports to allow Public Switch
Telephone Network(PSTN) analog phone connections.
 IEEE 802.11 b/g/n interoperability with multiple vendors.
 Wireless WEP, WPA, and WPA2 encryption, Hide SSID, and MAC Filtering.
 VPN pass-through support using PPTP, L2TP, or IPSec.
 Advanced SPI firewall Gateway for enhanced network security fromattacks over the
Internet:
– Firewall protection with Stateful Packet Inspection
– Client privileges
– Hacker prevention
– Protection from denialof service (DoS) attacks
– Network Address Translation (NAT)
 Universal Plug and Play (UPnP) enables any UPnP device seamlessly.
 Quality of Service (QoS) ensures high-quality performance withexisting networks.
 Effortless plug-and-play installation.
 Intuitive graphical user interface (GUI) configuration, regardless of operating system.
 Comprehensive front panel LEDs for network status and troubleshooting.
 Compatible with all popular Internet applications.

Preface
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SMCD3GNVWireless Cable Modem Gateway User Manual
Document Organization
This document consists of four chapters and two appendixes.
 Chapter 1 - describes the contents in the Gateway package, system requirements, and
an overview of the Gateway’s front, rear, top, and bottom panels.
 Chapter 2 - describes how to install the Gateway.
 Chapter 3 - describes how to configure TCP/IPsettings on the computer you will use to
configure the Gateway.
 Chapter 4 - describes how to configure the Gateway.
 Chapter 6 – provides troubleshooting information youcan use in the unlikely event you
encounter a problem with the Gateway.
 lists the Gateway’s specifications.
contains compliance information.
Document Conventions
This document uses the followingconventions to draw your attention to certain information.
Safety and Warnings
This document uses the following symbols to draw your attention to certain information.
Symbol Meaning Description
Note Notes emphasize or supplement important points of the main text.
Tip Tips provide helpful information, guidelines, or suggestions for performing tasks more
effectively.
Warning Warnings indicate that failure to take a specified action could result in damage to the
device.
Electric Shock Hazard This sym ol warns users of electric shock hazard. Failure to take appropriate
precautions such as not opening or touching hazardous areas of the equipment could
result in injury or death.

Preface
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SMCD3GNV Wireless Cable ModemGateway User Manual
Typographic Conventions
This document also uses the following typographic conventions.
Convention Description
Bold Indicates text on a window, other than the window title, including menus, menu options, uttons, fields, and la els.
Italic Indicates a varia le, which is a placeholder for actual text provided y the user or system. Angled rackets (< >)
are also used to indicate varia les.
screen/code Indicates text that is displayed on screen or entered y the user.
< > angled
rackets
Indicates a varia le, which is a placeholder for actual text provided y the user or system. Italic font is also used to
indicate varia les.
[ ] square
rackets
Indicates optional values.
{ } races Indicates required or expected values.
| vertical ar Indicates that you have a choice etween two or more options or arguments.

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SMCD3GNV Wireless Cable ModemGateway User Manual
1 Getting to Know the Gateway
Before you install your SMCD3GNV3 Wireless Cable Modem Gateway, check the package
contents and become familiar with the Gateway’s front and back panels.
The topics coveredin this chapter are:
 Unpacking Package Contents (page 12)
 System Requirements (page 12)
 Front Panel(page 13)
 Rear Panel (page 15)
 Top Panel (page 16)
 BottomPanel (page 16)
 Using the Reset Button (page 17)

錯誤
錯誤錯誤
錯誤! 使用
使用使用
使用 [常用
常用常用
常用] 索引標籤將
索引標籤將索引標籤將
索引標籤將 Heading 1 套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字。
。。
。
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SMCD3GNV Wireless Cable ModemGateway User Manual
Unpacking Package Contents
Unpackthe items inyour SMCD3GNV3 Wireless Cables Modem Gateway contents and
confirmthat no items are missing or damaged. Your package should include:
 One SMCD3GNV3 Wireless Cable Modem Gateway
 One 2600 mAh battery
 One Category 5E Ethernet cable
 One CD that contains this User Manual
If any items are missing or damaged, please contact your cable service provider. Keep the
carton, including the original packing material, in case you needto store the product or
return it.
System Requirements
To complete your installation, you will need the following items:
 ProvisionedInternet access ona cable network that supports cable modemservice.
 A computer with a wired network adapter with TCP/IP installed.
 A Java-enabledWeb browser, such as Microsoft Internet Explorer 5.5 or above.
 Microsoft
®
Windows
®
2000 or higher for USB driver support.
 An analog telephone and two RJ-11 cables if you want to connect the Gateway to an
analog telephone and PSTN telephone line.

錯誤
錯誤錯誤
錯誤! 使用
使用使用
使用 [常用
常用常用
常用] 索引標籤將
索引標籤將索引標籤將
索引標籤將 Heading 1 套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字。
。。
。
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SMCD3GNVWireless Cable Modem Gateway User Manual
Front Panel
The front panel of your SMCD3GNV3 Wireless Cable Modem Gateway contains a set of
light-emitting diode (LED) indicators. These LEDs showthe status of the Gateway and
simplify troubleshooting.
Figure 1 shows the front panel of the SMCD3GNV3 Wireless Cable Modem Gateway. Table
1 describes the front panel LEDs.
Figure 1. Front Panel of the SMCD3GNV3 Wireless Cable Modem Gateway

錯誤
錯誤錯誤
錯誤! 使用
使用使用
使用 [常用
常用常用
常用] 索引標籤將
索引標籤將索引標籤將
索引標籤將 Heading 1 套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字。
。。
。
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SMCD3GNV Wireless Cable ModemGateway User Manual
Table 1. Front Panel LEDs
LED Color Description
POWER White ON = power is supplied to the Gateway.
OFF = power is not supplied to the Gateway.
US/DS White Blinking = ranging is in progress.
ON = ranging is complete on 1 channel only.
OFF = scanning for DS channel.
DS White Blinking = scanning for DS channel.
ON = synchronized on 1 channel only.
US and DS Both US and DS linking together = operator is performing maintenance.
Online White Blinking = ca le interface is acquiring IP, ToD, CM configuration.
ON = Gateway is operational.
OFF = Gateway is offline.
WiFi White Blinking = data is transmitting over the Gateway’s Wi-Fi interface.
ON = Wi-Fi is ena led.
OFF = Wi-Fi is disa led.
Tel1 White Blinking = telephone line 1 is in use.
ON = Gateway’s telephone 1 port is online.
OFF = Gateway’s telephone 1 port is not online.
Tel2 White Blinking = telephone line 2 is in use.
ON = Gateway’s telephone 2 port is online.
OFF = Gateway’s telephone 2 port is not online.
Battery White Blinking = Gateway attery power is low. Please apply AC power as soon as possi le.
ON = Gateway is operating from attery power.
OFF = Gateway is operating from AC power.

錯誤
錯誤錯誤
錯誤! 使用
使用使用
使用 [常用
常用常用
常用] 索引標籤將
索引標籤將索引標籤將
索引標籤將 Heading 1 套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字。
。。
。
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SMCD3GNVWireless Cable Modem Gateway User Manual
➊
➌
➍
➎
➋
Rear Panel
The rear panel of your SMCD3GNV3 Wireless Cable Modem Gateway contains a reset
button andthe ports for attaching the supplied power adapter and making additional
connections. Figure 2 shows the rear panelcomponents and Table 2 describes their
meanings.
Figure 2. Rear View of the SMCD3GNV3 Wireless Cable Modem Gateway
Table 2. SMCD3GNV3 Wireless Cable Modem Gateway Rear Panel Components
Item Description
➊
Reset utton Use this utton to reset the power or restore the default factory settings (see “Using the Reset
Button” on page 17).
➋
USB USB 2.0 high-speed port for USB-ena led peripherals.
➌
Tel 1-2 Connect an analog telephone to one port and an analog (PSTN) telephone line to the other port.
➍
Ethernet 1-4 Four 10/100/1000 auto-sensing RJ-45 switch ports. Connect devices on your LAN such as a
computer, hu , or switch to these ports.

Ca le Connect your coaxial ca le line to this port.

Power 110 VAC Connect the supplied power cord.


錯誤
錯誤錯誤
錯誤! 使用
使用使用
使用 [常用
常用常用
常用] 索引標籤將
索引標籤將索引標籤將
索引標籤將 Heading 1 套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字。
。。
。
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SMCD3GNVWireless Cable Modem Gateway User Manual
Top Panel
The top panel of your SMCD3GNV3 Wireless Cable Modem Gateway has a WPS button for
configuring wireless security automatically. Figure 3 shows the WPS button.
Figure 3. Top View of the SMCD3GNV3 Wireless Cable Modem Gateway
Bottom Panel
The bottom panel of your SMCD3GNV3 Wireless Cable Modem Gateway contains a panel
for installing the Gateway’s battery. For information about installing the battery, see
“Installing a Battery” on page 20.

錯誤
錯誤錯誤
錯誤! 使用
使用使用
使用 [常用
常用常用
常用] 索引標籤將
索引標籤將索引標籤將
索引標籤將 Heading 1 套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字。
。。
。
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SMCD3GNVWireless Cable Modem Gateway User Manual
Using the Reset Button
Using the reset button on the rear panel(see Figure 2 on page 15), you can performtwo
types of reset operations withthe Gateway:
 Software reset – this reset operation power-cycles the Gateway and retains its current
configuration settings.
 Factory default reset – this operation remove all overrides made to the Gateway’s factory
default configuration and returns the Gateway to its original factory default settings.
The number of seconds you press the reset button determines whichreset operation is
performed. To protect against accidental resets, the reset buttonis recessed onthe
Gateway rear panel.
Note: You can also reset the Gateway andretainits current configuration settings using the
RESET method described under “Restoring or Rebooting the Gateway” on page 98.
To use the reset button to perform a software or factory default reset:
1. Leave power plugged into the Gateway.
2. Find the reset buttonat the top of the back panel, then use a thin object to press and hold
the reset button as follows:
– To perform a software reset, press the reset buttonfor at least 10 seconds.
– To perform a factory default reset, press the reset button for at least 15 seconds.
3. Release the reset button.

18
SMCD3GNV Wireless Cable ModemGateway User Manual
2 Installing the Gateway
This chapter describes how to install your SMCD3GNV3 Wireless Cable Modem Gateway.
The topics coveredin this chapter are:
 Finding a Suitable Location (page 19)
 Installing a Battery (page 20)
 Connecting to the LAN (page 21)
 Connecting the WAN (page 22)
 Powering on the Gateway (page 23)

錯誤
錯誤錯誤
錯誤! 使用
使用使用
使用 [常用
常用常用
常用] 索引標籤將
索引標籤將索引標籤將
索引標籤將 Heading 1 套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字。
。。
。
19
SMCD3GNV Wireless Cable ModemGateway User Manual
Finding a Suitable Location
Your SMCD3GNV3 Wireless Cable Modem Gateway can be installed in any location with
access to the cable network. All of the cables connect to the rear panelof the Gateway for
better organization and utility. The LED indicators onthe front panel are easily visible to
provide you with information about network activity and status.
For optimum performance, the location you choose should:
 Be close to a working AC power outlet when powering the Gateway using AC power.
 Allow at least one foot of space around the sides andtopof the Gateway to provide
sufficient air flow around the device.
 Not expose the Gateway to a dusty or wet environment.
 Be an elevated location such as a high shelf, keeping the number of walls andceilings
betweenthe Gateway and your other devices to a minimum.
 Be away from electrical devices that are potential sources of interference, such as ceiling
fans, home security systems, microwaves, orthe base for a cordless phone.
 Be away from any large metalsurfaces, such as a solid metal door or aluminumstuds.
Large expanses of other materials such as glass, insulated walls, fish tanks, mirrors,
brick, and concrete can also affect your wireless signal. For more information about
selecting an optimum locationfor wireless operation, see “Guidelines for Improving Your
Wireless Network” on page 201.

錯誤
錯誤錯誤
錯誤! 使用
使用使用
使用 [常用
常用常用
常用] 索引標籤將
索引標籤將索引標籤將
索引標籤將 Heading 1 套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字套用到您想要在此處顯示的文字
套用到您想要在此處顯示的文字。
。。
。
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SMCD3GNVWireless Cable Modem Gateway User Manual
Installing a Battery
To install a battery into the Gateway, use the following procedure.
1. Place the Gateway on its side on a table.
2. Remove battery compartment door on the bottom panel andset it aside (see Figure 4).
Figure 4. Removing the Battery Compartment Door
3. Insert the battery into the battery compartment (see Figure 5).
Figure 5. Installing the Battery
4. Close the battery compartment.
Note: Using the Battery menu in the Gateway’s Webinterface, you canview status
information about the battery (see “Viewing Battery Settings” on page 57).