NAT/ Proxy

Question

Hello,
I'm not sure if this is possible, but here is a diagram and
explanation of what I would like to achieve.
(Inside) --- Cisco Router --- (Outside) ----[Public Internet]---- Host A
|
|
------ Host B
1) Host A connects to Cisco Router on port 5555
2) Cisco Router translates/forwards the request to Host B on port 7777
- Cisco Router is acting like a proxy/boarder gateway for Host A
- Host B only see Cisco Router connecting to it.
- Host A has no idea it's actually connecting to Host B
Any ideas would be appreciated.
--Matteo

Answer 1

Hi,
Yes, it's a NAT feature.
Your config would look something like this:
ip nat inside source static tcp (192.168.10.1) 777 (171.69.232.209) 555
Where 192.168.10.1 is Host B's address. 171.69.232.209 is the outside Router's address used as gateway by the Host A.
In additon to this, you would need to configure your nat inside and outside interfaces. If both hosts are connected via the same interface then you could use a feature called NAT on a stick. The following link has info on configuration NAT on a stick.
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094430.shtml
Hope that helps!
Regards,
Sundar