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3. Communication between your PCs and the networking side.
Example:
The Wireless Cable Gateway offers a number of built-in web pages which
you can use to configure its networking side; when you communicate with
the networking side, your communication is following this path. Each
packet on the Internet addressed to a PC in your home travels from the
Internet down- stream on the cable company’s system to the WAN side of
your Wireless Cable Gateway. There it enters the Cable Modem section,
which inspects the packet, and based on the results, proceeds to either
forward or block the packet from proceeding on to the Networking section.
Similarly, the Networking section then decides whether to forward or block
the packet from proceeding on to your PC. Communication from your
home device to an Internet device works similarly, but in reverse, with the
packet traveling upstream on the cable system.
5.3 Cable Modem (CM) Section
The cable modem (or CM) section of your gateway uses DOCSIS or EURO-
DOCSIS Standard cable modem technology. DOCSIS or EURO-DOCSIS
specifies that TCP/IP over Ethernet style data communication be used between
the WAN interface of your cable modem and your cable company.
A DOCSIS or EURO-DOCSIS modem, when connected to a Cable System
equipped to support such modems, performs a fully automated initialization
process that requires no user intervention. Part of this initialization configures
the cable modem with a CM IP (Cable Modem Internet Protocol) address, as
shown in Figure 3-2, so the cable company can communicate directly with the
CM itself.
5.4 Networking Section
The Networking section of your gateway also uses TCP/IP (Transmission
Control Protocol/ Internet Protocol) for the PCs you connected on the LAN
side. TCP/IP is a networking protocol that provides communication across
interconnected networks, between computers with diverse hardware
architectures and various operating systems.
TCP/IP requires that each communicating device be configured with one or
more TCP/IP stacks, as illustrated by Fig.3-2. On a PC, you often use software
that came with the PC or its network interface (if you purchased a network
interface card separately) to perform this configuration. To communicate with
