Windows Server 2003 can do much more than just file sharing
and Web site hosting. Using the Routing And Remote Access Services (RRAS)
component, you can configure your Windows Server 2003 system to act as a router.
For this to work, you need to have multiple network adapters on different
subnets.

To set this up, follow these steps:

  1. Start
    RRAS by going to Start | All Programs | Administrative Tools | Routing And
    Remote Access.
  2. Locate
    the server in the left-hand pane, and right-click it.
  3. Select
    Configure And Enable Routing And Remote Access from the shortcut menu.
    This launches a wizard.
  4. On the
    first step of the wizard, select Custom Configuration, and click Next.
  5. On the
    Custom Configuration page in the wizard, select the LAN Routing option.
  6. Click
    Next, and click Finish.

In the RRAS window, right-click the server, and select
Properties. On the General tab, you’ll see the Enable This Computer As A Router
option selected, along with the Perform LAN Routing Only option. On the IP tab,
you’ll see the Enable IP Routing option selected.

Depending on your network topology, you may need to
reconfigure your clients to use this server as their default router.

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