I recently installed an Ironport S360 box. Using only the M1 interface in proxy forward mode. I have an issue with routing. I have defined routes on the box for networks in different subnets but the Ironport is not able to route traffic to these networks. Everything works fine with traffic from the same subnet or if I have it pointing to a core network switch with those routes. Is there any reason the M1 interface would not adhere to the defined routing list?