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Reference Manual for the Model CG814M Wireless Cable Modem Gateway
B-16
Networks, Routing, and Firewall Basics
are exchanged at one of the two cable connectors. Crossover cables are often unmarked as such,
and must be identified by comparing the two connectors. Since the cable connectors are clear
plastic, it is easy to place them side by side and view the order of the wire colors on each. On a
straight-through cable, the color order will be the same on both connectors. On a crossover cable,
the orange and blue pairs will be exchanged from one connector to the other.
Cable Quality
A twisted pair Ethernet network operating at 10 Mbits/second (10BASE-T) will often tolerate low
quality cables, but at 100 Mbits/second (10BASE-Tx) the cable must be rated as Category 5, or
"Cat 5", by the Electronic Industry Association (EIA). This rating will be printed on the cable
jacket. A Category 5 cable will meet specified requirements regarding loss and crosstalk. In
addition, there are restrictions on maximum cable length for both 10 and 100 Mbits/second
networks.
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Page 87 / 102
Reference Manual for the Model CG814M Wireless Cable Modem Gateway
Preparing Your Network
C-1
Appendix C
Preparing Your Network
This appendix describes how to prepare your network to connect to the Internet through the
CG814M Wireless Cable Modem Gateway and how to verify the readiness of broadband Internet
service from an Internet service provider (ISP).
Preparing Your Computers for TCP/IP Networking
Computers access the Internet using a protocol called TCP/IP (Transmission Control Protocol/
Internet Protocol). Each computer on your network must have TCP/IP installed and selected as its
networking protocol. If a Network Interface Card (NIC) is already installed in your PC, then TCP/
IP is probably already installed as well.
Most operating systems include the software components you need for networking with TCP/IP:
•
Windows
®
95 or later includes the software components for establishing a TCP/IP network.
•
Windows 3.1 does not include a TCP/IP component. You need to purchase a third-party TCP/
IP application package such as NetManage Chameleon.
•
Macintosh Operating System 7 or later includes the software components for establishing a
TCP/IP network.
Note:
If an ISP technician configured your computer during the installation of a
broadband modem, or if you configured it using instructions provided by your ISP, you
may need to copy the current configuration information for use in the configuration of
your gateway. Write down this information before reconfiguring your computers. Refer
to
“Obtaining ISP Configuration Information for Windows Computers
” on
page C-10
or
“Obtaining ISP Configuration Information for Macintosh Computers
” on
page C-11
for
further information.
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Page 88 / 102
Reference Manual for the Model CG814M Wireless Cable Modem Gateway
C-2
Preparing Your Network
•
All versions of UNIX or Linux include TCP/IP components. Follow the instructions provided
with your operating system or networking software to install TCP/IP on your computer.
In your IP network, each PC and the gateway must be assigned a unique IP addresses. Each PC
must also have certain other IP configuration information such as a subnet mask (netmask), a
domain name server (DNS) address, and a default gateway address. In most cases, you should
install TCP/IP so that the PC obtains its specific network configuration information automatically
from a DHCP server during bootup. For a detailed explanation of the meaning and purpose of
these configuration items, refer to “
Appendix B, “Networks, Routing, and Firewall Basics
.”
The CG814M Gateway is shipped preconfigured as a DHCP server. The gateway assigns the
following TCP/IP configuration information automatically when the PCs are rebooted:
•
PC or workstation IP addresses—192.168.0.2 through 192.168.0.254
•
Subnet mask—255.255.255.0
•
Gateway address (the gateway)—192.168.0.1
These addresses are part of the IETF-designated private address range for use in private networks.
Configuring Windows 95, 98, and ME for TCP/IP Networking
As part of the PC preparation process, you need to manually install and configure TCP/IP on each
networked PC. Before starting, locate your Windows CD; you may need to insert it during the
TCP/IP installation process.
Install or Verify Windows Networking Components
To install or verify the necessary components for IP networking:
1.
On the Windows taskbar, click the Start button, point to Settings, and then click Control Panel.
2.
Double-click the Network icon.
The Network window opens, which displays a list of installed components:
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Page 89 / 102
Reference Manual for the Model CG814M Wireless Cable Modem Gateway
Preparing Your Network
C-3
You must have an Ethernet adapter, the TCP/IP protocol, and Client for Microsoft Networks.
If you need to install a new adapter, follow these steps:
a.
Click the Add button.
b.
Select Adapter, and then click Add.
c.
Select the manufacturer and model of your Ethernet adapter, and then click OK.
If you need TCP/IP:
a.
Click the Add button.
b.
Select Protocol, and then click Add.
c.
Select Microsoft.
d.
Select TCP/IP, and then click OK.
Note:
It is not necessary to remove any other network components shown in the
Network window in order to install the adapter, TCP/IP, or Client for Microsoft
Networks.
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Reference Manual for the Model CG814M Wireless Cable Modem Gateway
C-4
Preparing Your Network
If you need Client for Microsoft Networks:
a.
Click the Add button.
b.
Select Client, and then click Add.
c.
Select Microsoft.
d.
Select Client for Microsoft Networks, and then click OK.
3.
Restart your PC for the changes to take effect.
Enabling DHCP to Automatically Configure TCP/IP Settings
After the TCP/IP protocol components are installed, each PC must be assigned specific
information about itself and resources that are available on its network. The simplest way to
configure this information is to allow the PC to obtain the information from the internal DHCP
server of the CG814M Gateway. To use DHCP with the recommended default addresses, follow
these steps:
1.
Connect all PCs to the gateway, then restart the gateway and allow it to boot.
2.
On each attached PC, open the Network control panel (refer to the previous section) and select
the Configuration tab.
3.
From the components list, select TCP/IP->(your Ethernet adapter) and click Properties.
4.
In the IP Address tab, select “Obtain an IP address automatically”.
5.
Select the Gateway tab.
6.
If any gateways are shown, remove them.
7.
Click OK.
8.
Restart the PC.
Repeat steps 2 through 8 for each PC on your network.
Selecting Windows’ Internet Access Method
1.
On the Windows taskbar, click the Start button, point to Settings, and then click Control Panel.
2.
Double-click the Internet Options icon.
3.
Select “I want to set up my Internet connection manually” or “I want to connect through a
Local Area Network” and click Next.
4.
Select “I want to connect through a Local Area Network” and click Next.
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