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Date: Wed, 27 Apr 2005 10:35:21 +0100
From: Alex Zbyslaw <xfb52@dial.pipex.com>
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Subject: Re: netcat strange behaviour
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shibbsd@spymac.com wrote:

>mypopserver.pop3: P [bad tcp cksum 2f41 (->71d2)!] 0:40(40) ack 36 win 65535
>[...omitted...]
>        0x0030:  ffff 2f41 0000 5553 4552 20XX XXXX XXXX  ../A..USER.XXXXX
>        0x0040:  XXXX XXXX 0a50 4153 5320 XXXX XXXX XXXX  XXXX.PASS.XXXXXX
>        0x0050:  XXXX XX0a 5354 4154 0a51 5549 540a       XXX.STAT.QUIT.
>[...omitted...]
>
>And my BIG question is:
>should netcat send all these POP3 commands in one packet?
>
I see netcat sending the stuff in separate packets.

And I'd be worried by the bad tcp cksum as well.  That shouldn't happen, 
and again not something I see.

Is your netcat port up to date?  Have you tried just remaking it?

(I'm on FreeBSD 4.11 for reference, and my port is netcat-1.10_2)

--Alex