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You won't have to worry about the ip default command because you have a default route. You can use your show run and move your nat commands over any where you see your fa8 configured with something( like ip nat outside). but make sure you Change you...
Just as I was saying before the giga0 port is the main wan port for this device. So I would try using cp express and config your giga0 as your Internet facing interface and see if that works. That is how I solved the issue with my 891wSent from Cisco...
show run | include natthis should show you your main nat commandip nat inside source list (ip access list) interface fastethernet 8 overloadif you see this then doshow ip access (ip access list number or name)make sure that your access list includes ...
Do you have nat setup?If so do you have a default route 0.0.0.0 0.0.0.0 pointing to your wan interface?Your ISP, you said you were conneted to a modem so i assume that you are getting a dhcp from that modem or is it static?"Nowhere in sh run do I see...