RSH/RLOGIN/REXEC/TELNET TCP Checksum

#1 (**permalink**) 09-02-2005

I am working on captured ethereal packets of RSH, RLOGIN, REXEC and
TELNET sessions. I have noticed that whenever TCP payload size is 1,in
any of the above sessions, the TCP checksum is always 0xFE29. And,
whenever some data is exchanged, TCP checksum is always incorrect. Can
anybody verify it and explain to me this strange behavior, or is it a
normal behavior of these protocols. Any help with specification or
protocol details of RSH and REXEC will be usefull to me.

#2 (**permalink**) 09-05-2005

The problem is solved! It was checksum offloading by NIC. See
http://www.ethereal.com/faq.html

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