Linksys RT31P2 - Broadband Router Guide

A Division of Cisco Systems, Inc.
®
Model No.
RT31P2
with 2 Phone Ports
Broadband Router
Installation and Troubleshooting Guide
VoIP
VoIP

Broadband Router with 2 Phone Ports
Copyright and Trademarks
Specifications are subject to change without notice. Linksys is a registered trademark or trademark of Cisco Systems,
Inc. and/or its affiliates in the U.S. and certain other countries. Copyright © 2004 Cisco Systems, Inc. All rights
reserved. Other brands and product names are trademarks or registered trademarks of their respective holders.
How to Use this Guide
Your guide to the Broadband Router has been designed to make understanding networking with the Phone
Adapter easier than ever. Look for the following items when reading this Guide:
In addition to these symbols, there are definitions for technical terms that are presented like this:
Also, each figure (diagram, screenshot, or other image) is provided with a figure number and description, like
this:
Figure numbers and descriptions can also be found in the “List of Figures” section.
This exclamation point means there is a caution or warning and is
something that could damage your property or the Router.
This question mark provides you with a reminder about something you
might need to do while using the Router.
This checkmark means there is a note of interest and is something you
should pay special attention to while using the Router.
word: definition.
Figure 0-1: Sample Figure Description
RT31P2-UG-41011H BW
WARNING: This product contains chemicals, including lead, known to the State of California to cause
cancer, and birth defects or other reproductive harm. Wash hands after handling.

Broadband Router with 2 Phone Ports
Table of Contents
Chapter 1: Introduction 1
Welcome 1
What’s in this Guide? 2
Chapter 2: Networking Basics 5
An Introduction to Local Area Networks 5
The Use of IP Addresses 5
Chapter 3: Getting to Know the Router 7
The Back Panel 7
The Front Panel 8
Chapter 4: Connecting the Router 11
Overview 11
Connection Instructions 12
Chapter 5: Configuring the Router 13
Overview 13
How to Access the Web-based Utility 15
The Setup Tab - Basic Setup 16
The Setup Tab - DDNS 23
The Setup Tab - MAC Address Clone 25
The Setup Tab - Advanced Routing 26
The Security Tab - Filter 28
The Security Tab - VPN Passthrough 30
The Voice Tab 31
The Applications & Gaming Tab - Port Range Forwarding 31
The Applications & Gaming Tab - Port Triggering 32

Broadband Router with 2 Phone Ports
The Applications & Gaming Tab - UPnP Forwarding 33
The Applications & Gaming Tab - DMZ 36
The Applications & Gaming Tab - QoS 37
The Administration Tab - Management 40
The Administration Tab - Log 42
The Administration Tab - Factory Defaults 43
The Administration Tab - Firmware Upgrade 43
The Status Tab - Voice 44
The Status Tab - Router 45
The Status Tab - Local Network 46
Appendix A: Troubleshooting 47
Common Problems and Solutions 47
Frequently Asked Questions 61
Appendix B: Finding the MAC Address and IP Address for Your Ethernet Adapter 67
Windows 98 or Me Instructions 67
Windows 2000 or XP Instructions 68
For the Router’s Web-based Utility 68
Appendix C: Windows Help 69
Appendix D: Glossary 71
Appendix E: Specifications 77
Appendix F: Warranty Information 79
Appendix G: Regulatory Information 81
Appendix H: Contact Information 83

Broadband Router with 2 Phone Ports
List of Figures
Figure 3-1: Back Panel 7
Figure 3-2: Front Panel 8
Figure 4-1: Router Connection Diagram 11
Figure 4-1: Connect a PC 12
Figure 4-2: Connect a Telephone 12
Figure 4-3: Connect the Modem 12
Figure 4-4: Connect the Power 12
Figure 5-1: Router’s IP Address 15
Figure 5-2: Router Login 15
Figure 5-3: Setup Tab - Basic Setup (Obtain an IP automatically) 16
Figure 5-4: Static IP 17
Figure 5-5: PPPoE 18
Figure 5-6: RAS (for Singtel) 18
Figure 5-7: PPTP 19
Figure 5-8: Heart Beat Signal 20
Figure 5-9: Setup Tab - DDNS (DynDNS.org) 24
Figure 5-10: Setup Tab - DDNS (TZO.com) 24
Figure 5-11: Setup Tab - MAC Address Clone 25
Figure 5-12: Setup Tab - Advanced Routing 26
Figure 5-13: Routing Table Entry List 27
Figure 5-14: Security Tab - Filter 28
Figure 5-15: Filtered MAC Address 29

Broadband Router with 2 Phone Ports
Figure 5-16: Security Tab - VPN Passthrough 30
Figure 5-17: Voice Tab 31
Figure 5-18: Applications & Gaming Tab - Port Range Forwarding 31
Figure 5-19: Applications & Gaming Tab - Port Triggering 32
Figure 5-20: Applications & Gaming Tab - UPnP Forwarding 33
Figure 5-21: Applications & Gaming Tab - DMZ 36
Figure 5-22: Applications & Gaming Tab - QoS 37
Figure 5-23: Administration Tab - Management 40
Figure 5-24: Back up & Restore Configuration 41
Figure 5-25: Administration Tab - Log 42
Figure 5-26: Incoming Log Table 42
Figure 5-27: Outgoing Log Table 42
Figure 5-28: Administration Tab - Factory Defaults 43
Figure 5-29: Administration Tab - Firmware Upgrade 43
Figure 5-30: Status Tab - Voice 44
Figure 5-31: Status Tab - Router 45
Figure 5-32: Status Tab - Local Network 46
Figure 5-33: DHCP Active IP Table 46
Figure B-1: IP Configuration Screen 67
Figure B-2: MAC/Adapter Address 67
Figure B-3: MAC/Physical Address 68
Figure B-4: MAC Address Clone 68
Figure B-5: MAC Address Filter 68

Broadband Router with 2 Phone Ports
1
Chapter 1: Introduction
Welcome
Chapter 1: Introduction
Welcome
Thank you for choosing the Broadband Router with 2 Phone Ports. This Router will allow your computers to share
a high-speed Internet connection as well as resources, including files and printers. And after you have set up
your Internet phone service, you will be able to make phone or fax calls using your Internet connection.
How does the Router do all of this? By connecting your computers and peripherals, including phones or fax
machines, to the Router and connecting the Router to your cable or DSL modem, then the Router can direct and
control communications for your network.
But what does all of this mean?
Networks are useful tools for sharing Internet access and computer resources. Multiple computers can share
Internet access, so you don’t need more than one high-speed Internet connection. With Internet phone service,
your Internet access can now be shared by your phones or fax machines as well. You will be able to make phone
calls using the account you set up with your Internet phone service, even while you’re surfing the Internet. Plus,
you can access one printer from different computers and access data located on another computer’s hard drive.
Networks are even used for playing multiplayer video games. So, networks not only are useful in homes and
offices, but also can
be fun.
PCs on a wired network create a LAN, or Local Area Network. They are connected with Ethernet cables, which is
why the network is called “wired”. ethernet: an IEEE standard network
protocol that specifies how data is placed
on and retrieved from a common
transmission medium.
lan (local area network): the computers
and networking products that make up
the network in your home or office.

Broadband Router with 2 Phone Ports
2Chapter 1: Introduction
What’s in this Guide?
To create your network, install and set up the Router. To guide you through the process, Linksys strongly
recommends that you run the Setup Wizard on the Setup CD-ROM. If you prefer to manually set up the Router,
use the instructions in the Quick Installation or this Installation and Troubleshooting Guide to help you. These
instructions should be all you need to get the most out of the Router.
What’s in this Guide?
This guide covers the basic steps for setting up a network with a router. After going through “Chapter 3: Getting
to Know the Router,” most users will only need to use the following chapters:
• Chapter 4: Connecting the Router
This chapter instructs you on how to connect the Router to your cable or DSL modem, PCs, and telephones
(or fax machines).
• Chapter 5: Configuring the Router
This chapter explains how to configure the Router using your web browser and the Router’s Web-based
Utility. You will configure the Router using the settings provided by your ISP.
When you’re finished with the basic steps, then you are ready to connect to the Internet.
You also have other chapters available for reference:
• Chapter 1: Introduction
This chapter describes the Router’s applications and this Installation and Troubleshooting Guide.
• Chapter 2: Networking Basics
This chapter briefly explains how a network functions.

Broadband Router with 2 Phone Ports
3
Chapter 1: Introduction
What’s in this Guide?
• Appendix A: Troubleshooting
This appendix describes some possible problems and solutions, as well as frequently asked questions,
regarding installation and use of the Router.
• Appendix B: Finding the MAC Address and IP Address for Your Ethernet Adapter
This appendix instructs you on how to find the MAC address or Ethernet address of your PC’s Ethernet
network adapter.
• Appendix C: Windows Help
This appendix describes how you can use Windows Help for instructions about networking, such as
installing the TCP/IP protocol.
• Appendix D: Glossary
This appendix gives a brief glossary of terms frequently used in networking.
• Appendix E: Specifications
This appendix provides the technical specifications for the Router.
• Appendix F: Warranty Information
This appendix supplies the warranty information for the Router.
• Appendix G: Regulatory Information
This appendix supplies the regulatory information regarding the Router.
• Appendix H: Contact Information
This appendix provides contact information for a variety of Linksys resources, including Technical Support.

Broadband Router with 2 Phone Ports
4Chapter 1: Introduction
What’s in this Guide?