Thomson TCW710 Router Manual PDF (Setup & Configuration Guide)

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Chapter 2: Networking

Illustrations contained in this document are for representation only.

23

device. IRC used in an Internet instant messaging program, HTTP used by a web browser, and

FTP used by a file transfer program are all examples of applications. Inside the packet, these

applications are designated by their port number. Port 80, the standard HTTP port, is an example

of a port number.

The Networking section of the router performs many elegant functions by recognizing different

packet types based upon their contents, such as source and destination MAC address, IP address,

and ports.

Three Networking Modes

Your gateway can be configured to provide connectivity between your cable company and your

home LAN in any one of three Networking Modes: CM, RG, and CH. This mode setting is under

the control of your cable company, who can select the mode to match the level of home

networking support for which you have subscribed. All units ship from the factory set for the RG

mode, but a configuration file which the cable company sends the cable modem section during

its initialization can change it.

Cable Modem (CM) Mode

Fig. 12

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Chapter 2: Networking

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Fig. 13

CM (Cable Modem) Mode provides basic home networking. In this mode, two IP stacks are active:

•

IP Stack 1 - for use by the cable company to communicate with the cable modem section only.

This stack receives its IP address from the cable company during CM initialization. It uses the

MAC address printed on the label attached to the Wireless Cable gateway.

•

IP Stack 2 - for use by you, the end user, to communicate with the cable modem and

Networking sections, to access the internal web page diagnostics and configuration. This

stack uses a fixed IP address: 192.168.100.1. It uses a MAC address of MAC label + 1 (the

MAC label is found on the bottom of the unit). E.g., if the MAC address is 00:90:64:12:B:91

this MAC address would be 00:90:64:12:B1:92.

With CM Mode, your cable company must provide one IP address for the CM section, plus one for

each PC you connect from their pool of available addresses. Your cable company may have you

or your installer manually enter these assigned addresses into your PC, or use a DHCP Server to

communicate them to your PCs, or use a method that involves you entering host names into your

PCs.

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Chapter 2: Networking

Illustrations contained in this document are for representation only.

25

Note that in CM Mode, packets passing to the Internet to/from your PCs do not travel through

any of the IP stacks; instead they are directly bridged between the WAN and LAN sides.

Residential Gateway (RG) Mode

Fig. 14

Fig. 15

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Chapter 2: Networking

26

RG (Residential Gateway) Mode provides basic home networking plus NAT (Network Address

Translation). In this mode, three IP stacks are active:

•

IP Stack 1 - for use by the cable company to communicate with the Cable Modem section only.

This stack receives its IP address from the cable company during CM initialization. It uses the

MAC address printed on the label attached to the Wireless Cable Gateway.

•

IP Stack 3 - for use by you to remotely (i.e. from somewhere on the WAN side, such as at your

remote workplace) communicate with the Cable Modem and Networking sections, to

remotely access the internal web page diagnostics and configuration. This stack is also used

by your cable company to deliver packets between the Internet and the gateway’s networking

section so they can be routed to/from your PCs. This stack requires an IP address assigned by

the cable company from their pool of available addresses. Your cable company may have you

or your installer manually enter assigned addresses into your gateway, or use a DHCP Server

to communicate them, or use a method that involves you entering host names. This stack

uses a MAC address of MAC label + 2 (the MAC label is found on the bottom of the unit). E.g.,

if the MAC address is 00:90:64:12:B1:91, this MAC address would be 00:90:64:12:B1:93.

•

IP Stack 5 - for use by you to locally (i.e. from somewhere on the LAN side in your home)

communicate with the Cable Modem and Networking sections, to access the internal web

page diagnostics and configuration. This stack is also used by the gateway’s networking

section to route packets between the gateway’s Networking section and your PCs. This stack

uses a fixed IP address: 192.168.0.1. It uses a MAC address of MAC label + 4 (the MAC label

is found on the bottom of the unit). E.g., if the MAC address is 00:90:64:12:B1:91, this MAC

address would be 00:90:64:12:B1:95.

With RG Mode, your cable company must provide one IP address for the CM section, plus one for

the Networking section, from their pool of available addresses. With RG Mode, each PC you

connect gets an IP address from a DHCP Server that is part of the Networking section of the

gateway.

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Chapter 2: Networking

Illustrations contained in this document are for representation only.

27

CableHome (CH) Mode

Fig. 16

CH (CableHome) Mode provides all the functionality of RG mode and adds the ability of the cable

company to control the home networking configuration of your Wireless Cable Gateway for you,

so you don’t need to perform the configuration yourself. In this mode, four IP stacks are active:

•

IP Stack 1 - for use by the cable company to communicate with the Cable Modem section only.

This stack receives its IP address from the cable company during CM initialization. It uses the

MAC address printed on the label attached to the Wireless Cable Gateway.

•

IP Stack 3 - for use by your cable company to communicate with the Networking section to

help you configure and manage your home networking. This stack requires an IP address

assigned by the cable company from their pool of available addresses. Your cable company

may have you or your installer manually enter assigned addresses into your gateway, or use a

DHCP Server to communicate them, or use a method that involves you entering host names.

This stack uses a MAC address of MAC label + 2 (the MAC label is found on the bottom of the

unit). E.g., if the MAC address is 00:90:64:12:B1:91, this MAC address would be 00:90:64:12:

B1:93.

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