I am running windows XP. I am trying to use one computer with two NIC's to connect to two different networks. One network is just your basic LAN connecting to a server (we call it 2000 Server cause its running 2000 Server) with internet access. The other network has a server running automated tests (DTM Server running 2003 server). What I want to be is have one NIC A connect to the 2000 Server with Internet and NIC B connect to DTM server so I can use DTM studio to monitor tests. I have both networks completely separate from each other physically. Its two different CAT5 cables to two different switches.

Here is how I have it configured:

NIC A (2000 Server)

This NIC is on DHCP

IP: DHCP
Subnet: 255.255.255.0
Gateway: 192.168.100.250


NIC B (DTM Server)

IP: 10.10.10.22
Subnet Mask: 255.255.255.0
Gateway: 10.10.10.22

With this I can connect to my DTM server and run the monitoring software no problem, but I get no Internet access or access to the 2000 server. If I disable NIC B in Network Connections, then Internet and 2000 server access is available.

How can I connect to both without bridging the connection and giving internet access to the other network. It is very important that DTM server gets no internet access.

You need to remove the gateway on NIC B. This will allow you to access the DTM server (no need for a gateway there since you're on the directly connected subnet) and anything that isn't locally connected will go through NIC A (because of your default gateway).