On Thu, May 10, 2012 at 06:03:48PM +0100, abdelkader belahcene wrote:
*Hi,
I wrote a client/server programs, the server listen on port 5000 and
of course the client connected on that port , I check the communication via
the sniffex.c program from pcap (adapting something) , I noticed that
destination port ( used by the client) is not always the same and
completely different from the source port.
Here is an output example:
Device: loFilter expression: ip
Packet number 1:
From: 127.0.0.1
To: 127.0.0.1
Protocol: TCP The client send a request
Src port: 49611 The port is randomly choosed by
the client ??
Dst port: 5000
Packet number 2:
From: 127.0.0.1
To: 127.0.0.1
Protocol: TCP--- The answer from the server
Src port: 5000
Dst port: 49611
When I stopped the client and ran it again I got another Src port from the
client
The question is : why the port opened by the client is not the same, and
takes one randomly ??
That's the way TCP/IP works. Consult any handy reference, such
as TCP/IP Illustrated by W. Richard Stevens.
-dsr-
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