I have an internet circuit (T1) coming in to the serial 0 on a 1721. The IT guy on site wants to keep his router behind my cisco, no idea why.
L3 T1 <--> Cisco1721 <--> OtherRouter <--> Switch <--> PCs
I've got it working where a PC can browse the internet no problem. I'm using static nat with an overload statement. Then the guy tells me that I need to enable inbound port forwarding so that he can get to some internal server, let's say its 192.168.2.10. I ask him what the ports are, he says there are more than 30 so just enable them all. I'm a little confused. If I forward all inbound traffic to his server won't that screw up replies to other out to in queries?
Any help would be appreciated. Is this possible to forward all inbound traffic that isn't a reply to some IP? What statements would be required on either the serial 0 or the FE0/0 interfaces?