Re: Routing between 2 subnets is it possible with a 300D
If your policy is correct (you need two!) then it's due to incorrect routing.
Make sure your hosts have got the correct default route, like @Dave Hall has posted: one part of your hosts is in the 172.16 subnet, the other in the 172.18 subnet. Their IP config must have a default route of 172.16.0.220 and 172.18.0.220, respectively. The easiest way to make that happen is to configure DHCP servers on both ports and select "gateway: use interface address" in the setup.
Ede " Kernel panic: Aiee, killing interrupt handler!"