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MCSE: Windows 2000 Exams in a Nutshell by Paul Murphy, Michael Moncur

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IP Routing

An IP router, or gateway , is a device that has more than one network adapter and thus is connected to multiple subnets. Routers can pass packets between the subnets, allowing them to act as a contiguous network. Routers can be either dedicated hardware devices or software services on hosts.

Any Windows NT or Windows 2000 computer can act as an IP router if it has multiple network interfaces attached to two or more subnets. This type of node is referred to as a multihomed computer.

There are two basic types of IP routing: static routing uses a fixed routing table specifying available destinations, and dynamic routing maintains a routing table dynamically by communicating with other routers. These are examined in the sections that follow.

Static Routing

In static routing, a routing table stores information about available destinations and the gateway (router) they can be reached through. Routing tables are not exchanged between routers in any way, so the routes must be specified for each multihomed computer.

The route command, described later in this section, allows you to modify or display the routing table. Type route print to display the current routing table. The following is an example of a simple routing table:

Network Address
Netmask
Gateway Address
Interface
Metric
127.0.0.0
255.0.0.0
127.0.0.1
127.0.0.1
1
168.192.0.0
255.255.0.0
168.192.150.1
168.192.150.1
1
224.0.0.0
224.0.0.0
168.192.150.1
168.192.150.1
1

The route table includes the following ...

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