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< Erlang ~ TCP - Replying to a message (inet:peername question) |
| Amadeus |
 Posted: Tue Dec 01, 2009 12:46 pm |
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Joined: 23 Nov 2009
Posts: 4
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Hey again!
I'm working on setting up a TCP connection (making a Peer-to-Peer client), and I've ran into some problems with dynamicly replying to messages I get. Basicly, I get a message do a couple of calculations and then want to reply to the one that sent me the message in the first place. So I try using this:
Code: {ok, {PeerIP, PeerPort}} = inet:peername(MySocket)
But it seems that it returns the right IP but the wrong port, or at least I'm not listening to that port.
It works just perfect when I use two hard-coded ports.
Anyone here got any hints?
Cheers! |
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| Karalabe |
| Posted: Thu Dec 03, 2009 5:09 pm |
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Joined: 03 Jul 2009
Posts: 11
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With TCP you always have a "server" and a "client". The server listens to incoming connections, the client connects to the server.
Cosider this:
You start the server at IP 192.168.0.1 listening on port 31415.
A client from IP 192.168.0.2 connects to the server.
This would mean, that the TCP/IP stack on the client computer will request an unused port from the operating system and initiate a connection from there.
If the OS returns port number 55555 then the connection will be between 192.168.0.1:31415 (server) and 192.168.0.2:55555 (client). If on the server node you ask for the peername of the client, you should get back {ok, {"192.168.0.2", 55555}}. |
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| wuji |
| Posted: Mon Aug 27, 2012 7:45 am |
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| dongdongwu |
| Posted: Thu Sep 20, 2012 2:09 am |
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