This article is from the SSH - Secure Shell FAQ, by Thomas Koenig Thomas.Koenig@ciw.uni-karlsruhe.de with numerous contributions by others.
It is very likely that you are looking at a telnet, rlogin or X
session to the machine that you run ssh on. Check that those packets
really are ssh packets (for example by checking their port number;
sshd listens on port 22).
 
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