Do a search on Cisco for "reverse NAT" or "ip nat inside" and you'll see sample configs on how to do it.
 
Basically, you have to do an "ip nat outside" on the external interface connected to the internet  and "ip nat inside" on the internal interface (private).
 
And on global config mode, create "ip nat inside" rules.
example:
 
ip nat inside source static tcp 192.168.100.100 110 A.B.C.D 110
All packets received on A.B.C.D with destination port 110 are Nat-ed to the inside interface and passed on to 192.168.100.100 with a destination port of 110.
 
 
Let us know in greater details what if you're looking into specifics...
 
Kenneth
 
Anyone have experience with PAT.  I've researched things on the CCO & found very little information.  I found that a minimum of 11.3(9)T is required, but have seen little else as far as configs.  I am planning to use this for a dual Ethernet 2500, on a cable modem system...
 
Thanks All !!!
Phil

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