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Guest · Posted: Wed Feb 22, 2006 2:03 pm Post subject: TidUDPClient/Server NAT question

Hello,
I am trying to create a UDP based system running over GPRS. This
involves Network Address Translation.

When a client with a private IP address connects to the server, the IP
address seen at the server (after NAT) is the provider's IP address and
a "random" port number.

(The original Peer Port in TidUDPClient is also randomly assigned. )

If I want to send a response from the server to the client, I believe I
have to use the same NAT ip address and NAT random port. This will get
translated to the originator's private IP address and originating port.

The question is, how, if I do :-

IDUDPClientOutgoing.Send(aString);

Do I get the originating port number on which I should listen for that
reply?

Thanks, Jim

Guest

OK, solved it, I think I had an error, which meant I wasn't getting a
diagnostic ... works as expected now.

ta
Jim

Riki Wiki · Guest

Hoi Jim

Great that you solved your own problem, next time you post you need to be
aware of the importance of posting to the Borland news server.

Take a look here:
<http://tinyurl.com/8m5nw>
which links to
<http://delphi.wikicities.com/wiki/Delphi_Newsgroups>