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Chapter 1: Introduction

What’s in this Guide?

•

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.

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Broadband Router with 2 Phone Ports

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Chapter 1: Introduction

What’s in this Guide?

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Broadband Router with 2 Phone Ports

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Chapter 2: Networking Basics

An Introduction to Local Area Networks

Chapter 2: Networking Basics

An Introduction to Local Area Networks

Simply put, a router is a network device that connects two networks together.

The Router connects your local area network (LAN), or the group of PCs in your home or office, to the Internet.

The Router processes and regulates the data that travels between these two networks.

The Router’s Network Address Translation (NAT) technology protects your network of PCs so users on the

Internet cannot “see” your PCs. This is how your LAN remains private. The Router protects your network by

inspecting the first packet coming in through the Internet port before delivery to the final destination on one of

the Ethernet ports. The Router inspects Internet port services like the web server, ftp server, or other Internet

applications, and, if allowed, it will forward the packet to the appropriate PC on the LAN side.

The Use of IP Addresses

IP stands for Internet Protocol. Every device in an IP-based network, including PCs, print servers, and routers,

requires an IP address to identify its location, or address, on the network. This applies to both the Internet and

LAN connections.

There are two ways of assigning IP addresses to your network devices.

A static IP address is a fixed IP address that you assign manually to a PC or other device on the network. Since a

static IP address remains valid until you disable it, static IP addressing ensures that the device assigned it will

always have that same IP address until you change it. Static IP addresses are commonly used with network

devices such as server PCs or print servers.

static ip address

: a fixed address

assigned to a computer or device that is

connected to a network.

nat

(network address translation): NAT

technology translates IP addresses of a

local area network to a different IP

address for the Internet.

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Chapter 2: Networking Basics

The Use of IP Addresses

If you use the Router to share your cable or DSL Internet connection, contact your ISP to find out if they have

assigned a static IP address to your account. If so, you will need that static IP address when configuring the

Router. You can get the information from your ISP.

A dynamic IP address is automatically assigned to a device on the network. These IP addresses are called

dynamic because they are only temporarily assigned to the PC or other device. After a certain time period, they

expire and may change. If a PC logs onto the network (or the Internet) and its dynamic IP address has expired,

the DHCP server will assign it a new dynamic IP address.

A DHCP server can either be a designated PC on the network or another network device, such as the Router. By

default, the Router’s Internet Connection Type is

Obtain an IP automatically

(DHCP).

The PC or network device obtaining an IP address is called the DHCP client. DHCP frees you from having to

assign IP addresses manually every time a new user is added to your network.

For DSL users, many ISPs may require you to log on with a user name and password to gain access to the

Internet. This is a dedicated, high-speed connection type called Point to Point Protocol over Ethernet (PPPoE).

PPPoE is similar to a dial-up connection, but PPPoE does not dial a phone number when establishing a

connection. It also will provide the Router with a dynamic IP address to establish a connection to the Internet.

By default, a DHCP server (on the LAN side) is enabled on the Router. If you already have a DHCP server running

on your network, you MUST disable one of the two DHCP servers. If you run more than one DHCP server on your

network, you will experience network errors, such as conflicting IP addresses. To disable DHCP on the Router,

see the Basic Setup section in “Chapter 5: Configuring the Router.”

dynamic ip address

: a temporary IP

address assigned by a DHCP server.

dhcp

(dynamic host configuration

protocol): a protocol that lets one device

on a local network, known as a DHCP

server, assign temporary IP addresses to

the other network devices, typically

computers.

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Chapter 3: Getting to Know the Router

The Back Panel

Chapter 3: Getting to Know the Router

The Back Panel

The Router’s ports and the Reset button are located on the back panel of the Router.

Internet

This

Internet

port connects to your cable or DSL modem.

Phone1

For your primary Internet phone line, the

Phone1

port allows you to connect the Router to

your telephone (or fax machine) using an RJ-11 telephone cable (not included).

Phone2

If you have a second Internet phone line, the

Phone2

port allows you to connect the Router

to your second telephone (or fax machine) using an RJ-11 telephone cable (not included).

Ethernet 1-4

These four

Ethernet

ports connect to network devices, such as PCs or more switches.

Reset Button

There are two ways to reset the Router's factory defaults. Either press the

Reset Button

for

five seconds, or restore the defaults from the Router's Web-based Utility.

Power

The

Power

port is where you will connect the power adapter.

Figure 3-1: Back Panel

NOTE:

The Voice Factory

Default feature of the Router’s

Web-based Utility is protected

by a password available only

from your Internet phone

service provider. Contact your

provider for more information.

NOTE:

The Internet port only

accepts a straight-through

cable. Do NOT connect a

crossover cable to the

Internet port.

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