I have setup an FC4 box as a firewall/DHCP server between my internal network and cable modem. The FC4 box can browse the internet just fine. I can ping both internal and external interfaces from the firewall. My internal clients are getting DHCP and can ping the internal and external address of the firewall but can't ping or browse anything beyond that. Additionally, I cannot ping my internal client from the firewall (even though it is getting dHcp and CAN ping the firewall). Personal firewall is turned off on internal PC. IP forwarding is enabled on FC4 firewall. Don't know where to go next. Any ideas?