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From: neil@ux.cs.man.ac.uk (Neil Todd)
Newsgroups: net.unix-wizards,net.bugs.4bsd
Subject: Problem with DEUNA/Ethernet
Message-ID: <34@ux.cs.man.ac.uk>
Date: Fri, 7-Mar-86 09:20:57 EST
Article-I.D.: ux.34
Posted: Fri Mar  7 09:20:57 1986
Date-Received: Sun, 9-Mar-86 09:13:28 EST
Reply-To: neil@ux.cs.man.ac.uk  (Neil Todd)
Organization: Computer Science Dept, University of Manchester, UK
Lines: 34
Keywords: DEUNA, Ethernet, Checksum, 4.2BSD, 4.3BSD
Xref: watmath net.unix-wizards:17129 net.bugs.4bsd:1994

Sorry about the previous empty message.

Can somebody out there give me a few words of wisdom :-

I have a Vax 8600 running 4.3 Beta and two 750s running 4.2. They are
all on an ethernet, connected using DEUNAs.

Traffic between the 750s is fine. But the 8600 will run ok for about
an hour or so and then the Ethernet from the 8600 effectively dies -
the 750s remain ok. I've tried both the BBN and INET versions of the
code but with little change.  I've switched in the debugging and this
annouces that the 8600 thinks that there are checksum errors. We put
in a new DEUNA just in case the old one was duff, but this didn't
make any difference. We've run the full diagnostics on the whole
machine, but they didn't reveal anything.

Hedrick@topaz recently posted something to "Fix TCP hangs and slow
transfers", but after examining the code it is not relevent to 4.2 or
4.3.

So the question is - "What do I do now ?", 

BTW Is there a way of completely resetting the networking code without
rebooting, this would at least allow me to recover the ethernet when
this problem occurs.


				Neil Todd


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