Troubleshooting setting up a Windows 2000 server as a router

I teach a basic networking course for a NYC based non-for profit organization. I'm having some trouble setting up a Windows 2000 server as a router.

The server is configured with two NICs. One NIC, the external one, has the following configuration: 

IP: 172.16.12.250
Subnet Mask: 255.255.255.0
Gateway: 172.16.12.1
DNS: 198.6.1.98, 198.6.100.98

The internal card has this configuration:

IP: 192.168.0.1
Subnet Mask: 255.255.255.0
Gateway:
DNS:

From the internal computers I can ping the 192.168.0.1 and 172.16.12.250 cards; however, I cannot gain access to the Internet from any clients computers but the server itself.

Routing seems to be functioning OK internally, but the server is not forwarding client's packets to the gateway, or DNS servers.

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You have not specified any default gateway on the internal. On your client default gateway should be 192.168.0.1 and on internal card it should be 172.16.12.250.

This was first published in August 2003

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