NAT and Port Forwarding

[rocampo]

Question.

Can a router do port forwarding using the IP on

its interface ?

Setup.

Internet ---- Router ----- Mail Server ( Private IP )

ISP gave only 1 global IP address which was already used on the router interface. I have

a mail server that needs to be seen outside and

other workstations that need internet access.

[mhussein]

Hello,

This is possible, using NAT port forwarding with the extendable keyword. For example, port tcp 25 (smtp) can be forwarded/translated as follows:

ip nat inside source static tcp 25 25 extendable

This configuration example may be helpful:

http://www.cisco.com/warp/public/794/827spat.html

HTH,

Mustafa