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From: JMS@ARIZMIS.BITNET.UUCP
Newsgroups: mod.computers.vax
Subject: RE: DEQNA and Heartbeats
Message-ID: <8701312247.AA02769@ucbvax.Berkeley.EDU>
Date: Sat, 31-Jan-87 16:09:00 EST
Article-I.D.: ucbvax.8701312247.AA02769
Posted: Sat Jan 31 16:09:00 1987
Date-Received: Sun, 1-Feb-87 05:43:04 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
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Approved: info-vax@sri-kl.arpa

Recently Mr. Pung (PUNG@ORNL-NCC.ARPA) wrote about some problems he's
having with heartbeats and DELNIs.  I don't have a general-case solution,
but we are working on the exact same sort of problem here at Arizona,
in this case the connection of Ethernets using American Photonics bridges,
some American Photonics transceivers, some H4000s, and DEBETs (Lan Bridge
100s).  The symptom I observe is a half-duplex connection between
adjacent ethernets, with a full duplex connection between non-adjacent
Ethernets.  I'm literally in the middle of debugging the thing, but one
solution seems to be matching transceivers with equipment from the same
manufacturer, since all Heartbeat claims appear to be untrustworthy.
 
Hope this helps,
 
jms
 
(Joel M Snyder, University of Arizona MIS, JMS@ARIZMIS.BITNET)