Can't IP address 2nd NIC on Mac Pro

Hi all, I am having a problem using both nics at the same time on my Mac Pro 2009. I want to run different networks (different subnets) from each NIC but the 2nd nic won't let me IP address it, either statically or via DHCP.
If I try and statically assign an address it complains that there is an IP address conflict- even though I know for a fact that there isn't! If I try to use DHCP the nic won't take an address-I can see in the DHCP server that it assigns one but the Mac appears to release it almost immediately and doesn't show up as having been allocated on the Mac.
I know the Nic is good because if I plug it in on it's own (no connection to NIC 1)it picks up an IP from the DHCP server.
I'm new to Macs- is this a limitation of OSX? I tried a dual port pci express card but this has the same effect.
Thanks in advance for any help.

This isn't a limitation of the OS and my Mac Pros are dual homed. Give us specific numbers for the IP addresses and netmasks you're using on both interfaces and maybe we can spot the problem.

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