Path: utzoo!mnetor!uunet!husc6!mit-eddie!ll-xn!ames!pasteur!ucbvax!ccq.bbn.COM!pogran
From: pogran@ccq.bbn.COM (Ken Pogran)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: routing problems?  Core gateways?
Message-ID: <8801151726.AA20088@ucbvax.Berkeley.EDU>
Date: 15 Jan 88 16:00:43 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 25

Mike,

I can confirm that PSN 7.0 has NOT been installed in the MILNET
yet, and there's no chance that that PSN was accidentally reloaded
with PSN 7.0 software (hosts on that node wouldn't be able to
communicate AT ALL with the rest of the MILNET if that had
happened!).

I'm not plugged in to the trouble-shooting process on the MILNET,
so I can't speculate on what Brian's problem might actually be.
I agree with you that the external symptoms do resemble the
ARPANET PSN 7 "stuck VC" problem, but I think the explanation has
to turn out to be quite different.

Regards,
 Ken

P.S.: With regard to the point that "only Sun users experienced
the 'hung VC' problem with PSN 7.0", it's fair to say that Sun's
was the only X.25 implementation that we FOUND on the ARPANET
that encountered that problem; it's possible that other
implementors could have made the same design decisions that Sun
made and could have had the problem, too.  But, as I said above,
that's a PSN 7 problem and certainly isn't what Brian's seeing on
the MILNET right now.