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My Ubuntu runs ssh on port 22. But my /var/log/auth.log says different port numbers when connections are made. And the port numbers are seemingly random:

Connection from xxx.xxx.xxx.xxx port 33692
Connection from xxx.xxx.xxx.xxx port 32970

Why are these port numbers not 22? And is there a pattern behind which port numbers are picked?

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up vote 6 down vote accepted

That's the remote port, not the local port. The remote OS picks a random number in a high range for the SSH client to bind to, then the client connects to port 22 on the server.

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Are there any resources out there that explain in more detail how this works? – David Xia Feb 19 '12 at 9:44

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