> i can ping both interfaces from the according lan and interestingly
> i'm able to ping 192.168.1.1 from a machine inside the 10.200.3.0-lan,
> but that's it. i cannot ping other machines in the 192.168.1.0 net
> from 10.200.3.x and vice versa it's the same.

Do the boxes on the 10.200.3 net have your 10.200.3.254 box set as their
gateway?