Check your route tables ("netstat -nrf inet" or similar). If you have a blanket statement like:
192.168/16 link#2 <etc...> rl1
That could cause ALL 192.168 traffic to route through link#2. I've had this happen before, and it causes one NIC to appear to go "brain dead".
If you can't put them on seperate IP blocks (i.e. put one on 10/8, and the other on 192.168/16 or 172.16/12), you'll have to hammer out your routing tables (something I've never messed with since I could always switch to an unused private block).
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Linux/Network-Security Engineer by Profession. OpenBSD user by choice.
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