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    <p>The server and client in localhost don't use the same port.</p> <p>As a connected Tcp connection,</p> <p>To server,source port is A and destination port is B.</p> <p>To client,source port is B and destination port is A.</p> <p>A is set by bind() in server, and is known to all clinets; B is usually assigned by clinets' kernel, and is known to server when the server's accept() returns.</p> <p>In details:</p> <p>In tcp,the server's port is set by bind() which lets us specify a port number, an IP address, both, or neither, but it is rare for a TCP server to let the kernel choose an ephemeral port Afterwards, server listen() the port and IP address.</p> <p>and client uses connect() whose socket address structure must contain the IP address and port number of the server. <strong>the kernel will choose both an ephemeral port and the source IP address if necessary.</strong> Anyway, it can't be the port your server using.</p> <p>That's to say, the ports of a server and a clinet in the same computer is not the same.</p> <p><em>For example</em>, when simple C/S programs running in a localhost, typing netstat -t in terminal,and you will get:</p> <pre><code>Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 localhost:41742 localhost:9877 ESTABLISHED tcp 0 0 localhost:9877 localhost:41742 ESTABLISHED </code></pre> <p>the prots is obviously different.</p> <p>If you force the client to use the same port of your the one server is using on local by bind(), the bind() will return -1 as a error.</p>
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    1. POLinux/Unix Socket Self-connection
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    1. COI think you misunderstand my problem. what I talk is self-conncetion problem. There is actually no server in this situation i say. The program is connecting to itself actually.
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      1. USXiaotian Pei
    2. CO@SkyShaw look at this: http://lkml.indiana.edu/hypermail/linux/kernel/9909.3/0510.html , is it you want to see in fact?
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    3. COVery interesting discussion you found there, @vvy, but it seems to fade out without a conclusion. Was the patch to prevent accidental self-connection ever written and merged?
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      1. USWumpus Q. Wumbley
 

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