Chapter 2: Networking

24

Chapter 2

CM

Networking

IP Stack 1

111.111.1.11

IP Stack 3

111.111.2.11

IP Stack 5

192.168.0.1

WAN

LAN

Residential Gateway (RG) Mode

Fig. 14

Fig. 15

Chapter 2: Networking

Chapter 2

25

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.

Chapter 2: Networking

26

Chapter 2

CM

Networking

IP Stack 1

111.111.1.11

IP Stack 3

111.111.2.11

IP Stack 5

192.168.0.1

IP Stack 4

111.111.2.12

WAN

LAN

Fig. 16

CableHome (CH) Mode

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.

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 configuration. 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 configuration. 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 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 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 modifies 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.

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Chapter 2

MAC and IP Addresses Summary

This table summarizes all the MAC and IP addresses that may be associated with the TCP/IP

communication stacks and USB handling in your Wireless Cable Gateway. The ones actually

used depend upon your gateway Operating Mode, as explained above. At minimum, your cable

company will need to know the MAC address associated with IP Stack 1, which is the MAC

address shown on the modem label.

Purpose - Mode

MAC Address

IP Address

Stack Name

IP Stack 1

IP Stack 2

IP Stack 3

IP Stack 4

CM WAN access - all Modes

local management - CM Mode

only

per label on CM

CM label + 1

assigned by cable company

during initialization

CableHome remote management

- CH Mode only

CM label + 2

CM label + 3

fixed at 192.168.100.1

assigned by cable company

assigned by cable company

IP Stack 5

---

end-user remote management,

LAN WAN access -

RG Mode only

WAN data access -

CH Mode only

CM label + 4

fixed at 192.168.0.1

USB MAC

local management -

RG, CH Modes only

LAN gateway

CM label + 5

MAC and IP Addresses