How can I create a permanent NAT entry for a client?

[GeneralDzur]

Hey guys,

Basically I want a client to be able to connect to a web service, but when he's behind NAT it throws off the connection because he always gets a different port number. How do I fix that? I'd like to lock in a certain port number for his traffic coming off the Internet so I can setup the program on his computer to listen for traffic on that port only.

can that be done?

- stephan the confused

 

[lambent]

So you mean your client will have some kinds of services hosting behind NAT, right?

And how many public IP addresses did your ISP give you?

 

[GeneralDzur]

We only have one public IP (81.31.xx.xx)and right now I have it set to do Dynamic NAT with Overload.

I need to have a constant, reliable IP/Port for outside clients to connect to the interal client on.

- Stephan

 

[lambent]

Read this:

"Configuring Network Address Translation and Static Port Address Translation to Support an Internal Web Server"

http://www.cisco.com/en/US/tech/tk175/tk15/technologies_configuration_example09186a0080093e51.shtml

 

[MikeWire]

Assuming it is a web service (port 80) then do this:

ip nat inside source static tcp 192.168.0.5 80 171.68.1.1 80 extendable

at the end of the last octet just specify 80 for web - for RPD or remote desktop it would be 3389 etc...

 

[ROUTERKID1]

did the link work

 

[GeneralDzur]

Yes, the link worked (ROUTERKID1)

Thanks guys, as usual you're a huge help sans any condescending comments (like other forums.)

- stephan the grateful