From owner-freebsd-hackers  Wed May 29 04:42:17 1996
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Date: Wed, 29 May 1996 21:23:03 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199605291123.VAA00638@godzilla.zeta.org.au>
To: freebsd-bugs@freebsd.org, freebsd-hackers@freebsd.org,
        freebsd-isp@freebsd.org, freebsd-questions@freebsd.org,
        scotto@remuda.com
Subject: Re: SOLVED-->Re: sendmail read errors/timeouts etc.
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>the short answer is that i was running with an mtu of 296 via my 28.8
>connection.  
>...
>the troublesome sites apparently blocked tcp frags improperly (i know very
>little about implementing firewalls).  i verified that with the nintendo
>folks.  i can only guess about microsoft and msn.  regardless, my problem
>is gone.

Some microsoft networks are reported to respond incorrectly to mtu discovery
packets.

Bruce