I have a 4 port wan 2 port lan 3C8547 router. I have 3 wan's in use and I am trying to add the fourth, but have it only route between lan 2, itself, and the internet switch from ISP. I have ospf enabled and every time I add the the circuit , It is routing to the rest of the internal IP on lan 1 and the other 3 serial wans, bypassing my firewall. I am not familliar with 3com enough to know what my options are.