Why would I not be able to ping an IP external to my network from a router, but be able to ping those fine from any workstation? There is no internal domain and the 2505 ip name-servers are pointing to my isp's servers. I can ping the 2505 router from any workstation and I can ping any workstation from the router. The network is linked to the internet thru a linksys router which is defined as the ip default-gateway. Do I need a gateway of last resort?