Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!CS.UCL.AC.UK!J.Crowcroft
From: J.Crowcroft@CS.UCL.AC.UK (Jon Crowcroft)
Newsgroups: comp.protocols.tcp-ip
Subject: ultrix 2.2TCP problem
Message-ID: <8907011600.AA05987@ucbvax.Berkeley.EDU>
Date: 1 Jul 89 14:34:11 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 14


We are having trouble reaching a canadian site from some of our
machines - it's only Ultrix 2.2 ones, not earlier (1.2) or later (3.0)
or suns, hps, xeroxes, RTs, pyramids etc...they can all get throough
fine.

The symptom is odd: we send a SYN, and their (ultrix 3.0) never
replies, else they send a SYN, and we never reply - the packets look fine
by tcpdump; anyone got any clues...(cannot be filtering, coz we can
ping them with any packet sizes...)

thanks

jon