I have a Cisco 1841 that has two FastEthernet ports. I want to configure one port as a LAN port to talk to my PC and the other as a WAN port talking to my AirLink Raven X modem. I have FE 0/0 configured with IP address 192.168.13.100 that is directly connected to my AirLink modem with a gateway address of 18.104.22.168 and a fixed pulblic IP on the WAN side. Using the CLI I have successfully configured this FE port so I can ping out to any IP on the internet (using the CLI). I have FE0/1 port configured with IP address 192.168.15.100 and using the CLI have successfully configured DHCP on this port so the PC connects to it. From the PC, I can successfully ping 192.168.15.100 and 192.168.13.100 but cannot ping 192.168.13.31 which is my modem gateway on the LAN side. I need to be able to ping out (connect) to the internet from my PC, but am unable to thus far. Attached are a couple screen shots showing my IP route and running-config. Please help.