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Chapter 2: Networking
Illustrations contained in this document are for representation only.
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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