www.somesite.com = gateway IP address. For example; AddressBar:
10.1.1.1 <- this IP won't work but is a sample only.
Gateway Address = Router configuration page.
ok , goto your router and get the exact model then post it here.
if you done what I stated above then it will also be in the configuration on the router screen.
for example is it a
Linksys BEFSR11? unlikely but thats an example model.
to try yourself goto google and search for '<router-make> +<model> +forward +ports'
for example in
Google: linksys +BEFSR11 +forward +ports