Network requests using two network cards

[timsayles1]

Hello

I have a 2003 server with 2 nic's installed.

Nic 1 is on my 206.x network and Nic 2 is on my 10.x network.

I have a router between the 206.x and the 10.x network.

My 2003 server serves as DHCP and DNS for both networks.

For some reason my server is passing packets from the 10.x network thru the 206.x nic and visa versa. This could be requests from the server itself or DNS... I am not sure.

When the router get the packet it says "IP SPOOF" and drops the packets.

How can I stop the sever from sending 206.x packets out the 10.x card and visa versa?

I do not have remote access and routing installed. My external router handles all traffic for the two networks.

The Nic's Gateways are set to the external router's respective IP addresses.

Thank you in advance.

Tim

 

[CalBrit]

Yep, seen this one. for some unknown reason, (although Microsoft are blaming the TCP/IP protocol for multihomong issues), the move from 2000 to 2003 really did mess up the abilty to route out to two different subnets from one server.
The problem ( and lets be candid here - it IS a Microsoft problem ), is that 2003 can't handle multiple default gateways. We havent been able to find a cure, but we did find a workaround, the only one that works for us is the static routes senario, from a Microsoft article which I now can't find, but this should work:

1. Decide whch interface is going to host or send the most traffic, i.e. the one internet facing, and configure the DG for that subnet on that card.
2. Remove all DG's from the other card.
3. From the command line, add static,persistant routes for all networks the second NIC should route to.
I'd love to hear from anyone that has been able to get both NICs working with diffent default gateways.