Wiring Your Digital Home for Dummies (ISBN by 047191830X)

Author:047191830X)
Language: eng
Format: mobi
Tags: &NEW
Published: 2011-07-01T01:27:12+00:00

18_91830x ch12.qxp 8/24/06 8:49 PM Page 194

194 Part III: Installing Home Networks and Advanced Technology Figure 12-1:

View of

typical DSL

modem

connection

ports.

Installing and configuring a router

The first device between the Internet and your home’s computing devices is the modem, often provided by the ISP. The second device to install is a router. A router allows your connection to appear to the ISP as one IP

address, while at the same time connecting up to 254 computers and devices in your home to the Internet. The router uses DHCP to assign unique, local IP

addresses to each connected device.

When a computer on your home network connects to the Internet, the router acts as a proxy for the computer’s upstream requests and downstream data.

The router uses a process called network address translation (NAT) to keep track of the requests and downstream data traffic for each private IP address on the network.

Most consumer routers also include a firewall. A firewall allows the device to block (deny) or pass (allow) data packets that meet certain criteria, thereby protecting your network from unauthorized access. Your Windows computer operating system has firewall settings built in, and you can load third-party firewall software to enhance security. Use the firewall setting in the router

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