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From: klong@umd5.umd.edu (Kim Long)
Newsgroups: comp.sys.proteon
Subject: Overview Problem
Message-ID: <9010170358.AA02833@umd5.UMD.EDU>
Date: 17 Oct 90 03:58:28 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 38

I'm writing on behalf of the SURAnet NOC in regard to a problem
we are experiencing with the Overview Network Monitoring package.
Sometime last Saturday, the package began to behave in an unpredictable
manner without apparent reason.  No changes to the topography had been
made in over a week nor had any changes been made to the platform or
hard disk.  

The symptoms that occur are as follows:

	All nodes on the map turn red, links blue
	Keyboard/mouse lockup    
 	Disappearing links
	Relocation of nodes
	Reappearing links that randomly connect to nodes
        Total disappearance of the map from the screen leaving
		no datafiles in OVDATA upon reboot

Any one or all of the symptoms can occur at a given time.  Presently,
we are either performing a warm boot (or cold boot, if necessary) to
redraw the screen to get the current status.  We are currently having
to reboot about every 15 minutes, or less.

Using a sniffer we have examined the packets originating and destined
for the Overview unit.  The DLC, IP, and UDP protocol layers appear
to be intact.  However, the SNMP layer seems to become garbled
in various ways, generating different messages on the sniffer, from
"unknown syntax" to an "error" in the command area of the SNMP data
layer.  In 10 minutes time we captured over 4000 packets associated
with the Overview host. We are not seeing any collisions, crc's or 
framing errors on the ethernet.  Presently, we have 116 nodes that we  
query using Overview.  The cycle time is set to 55 and the resp time is
set to 1.5.

Would  you have any idea as to the cause of the problem?   Would a math
co-processor take some of the load off?  Thanks for your input.

Kim Long
SURAnet Operations