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Chapter 2: Networking
Chapter 2 27
IP Stack 4 - 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 confi guration. This stack is also used by your
cable company to deliver packets between the Internet and the Wireless Cable 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 these 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 + 3 (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:B1:94.
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 confi guration. This stack is also used by the Wireless Cable Gateway
Networking section to route packets between the Wireless Cable Gateway’s Networking
section and your PCs. This stack uses a fi xed 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 CH Mode, your cable company must provide one IP address for the CM section, plus two for
the Networking section, from their pool of available addresses. Each PC you connect gets an IP
address from a DHCP Server that is part of the Networking section of the gateway.
USB MAC Address
USB allows a single PC to be connected directly via your Wireless Cable Gateway USB port.
Other PCs can, of course, be connected to your other networking interfaces: wireless, HPNA, and
Ethernet. If you have a PC connected by USB, the following information is helpful.
The PCs you have connected by 802.11b/g Wireless, and Ethernet technologies associated with
your gateway all send and receive packets that contain the Ethernet-style MAC address associated
with that network interface. USB technology, however, uses a different addressing approach. In
this situation, your gateway modifi es the packets going to and from your USB-connected PC to
make them look Ethernet-style when passed between you and your cable company. To do this,
the gateway must effectively “loan” an Ethernet-style address for use in all these packets. For
this purpose, the gateway uses a MAC address of MAC label + 5 (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:B1:96.
DCW725 book file.indb 27 DCW725 book file.indb 27 10/6/04 11:17:25 AM10/6/04 11:17:25 AM
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