Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!JVNCA.CSC.ORG!heker
From: heker@JVNCA.CSC.ORG (Sergio Heker)
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  Routing loop, congestion, or what?
Message-ID: <8907161734.AA04025@jvnca.csc.org>
Date: 16 Jul 89 17:34:02 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 47

Brian,

Thank you for the detailed information on your message.  Certainly 
traceroute is a great debugging tool.

I received your message today regarding the problems to reach the JANET
network, and when looking at the date of your log is Mon Jul 10.  Almost
a week ago.

After checking our Cisco/syslog messages I didn't find any reference of
any entry for that date and timestamp that can correlate to the problem
that you are pointing at.  When looking at SNMP information that we
collect in all our Cisco gateways (we have 30 operational and 14 more
that are being installed) the findings are a high number of input
errors coming from the ARPANET (Zaphod and Ford are directly on the
ARPANET), plus errors from one of the ethernets that connects both
routers.  Of course to analyze a problem that was sampled for less than
two minutes, six days ago is hard if not impossible due to the dynamic
nature of the network.

Two comments about this.  The first one is that as soon as you notice
a problem like this, please notify us immediately.  You can do that
by phone (609) 520-2000, or by e-mail "JVNCnet-noc@jvnca.csc.org". We
operate the network 24 hours/7 days a week.
The second thing, is the ability to resolve names for the JANET domains,
we have been discussing the posibility of backing up those domains in
the US.  If we do that, the we will have resolved at least the name
server part.  As for the routing loop, we will try to make sense of the
stats that we have to better understand why the routing loop happened
in the first place, but the best way to deal with it is to work on the
problem when the problem is happening.

Again, thank you very much for your effort to isolate the problem by
yourself, and our appologies for not having been of much help to you
until know.  Let us help you in the future if you have a problem again.

					-- Sergio




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|		John von Neumann National Supercomputer Center		    |
|  Sergio Heker				tel:	(609) 520-2000		    |
|  Director for Networking		fax:	(609) 520-1089		    |
|  Internet: "heker@jvnca.csc.org"	Bitnet:	"heker@jvnc"		    |
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