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<== Date ==> <== Thread ==>

Subject: making sense of peculiar ifShow report
From: Matthieu Bec <mbec@gemini.edu>
To: tech-talk@aps.anl.gov
Date: Mon, 15 Jul 2002 21:31:32 -1000
Hi,

What follows is probably not a direct EPICS issue, but maybe someone has
seen this before or can help me make sense of the ifShow report below.
The system is an mv167 / 712 transition module (10baseT) / vxworks 5.2b,
an average size EPICS database (500 records) under 3.12.

ei (unit number 0):
     Flags: (0x8063) UP BROADCAST MULTICAST ARP RUNNING 
     Type: ETHERNET_CSMACD
     Internet address: 10.2.2.121
     Broadcast address: 10.2.2.255
     Netmask 0xff000000 Subnetmask 0xffffff00
     Ethernet address is 08:00:3e:25:53:72
     Metric is 0
     Maximum Transfer Unit size is 1500
     0 octets received
     0 octets sent
     2534236 packets received
     12661 packets sent
     2534236 unicast packets received
     4294967290 unicast packets sent
     0 non-unicast packets received
     12667 non-unicast packets sent
     0 input discards
     0 input unknown protocols
     24186 input errors
     6 output errors
     0 collisions; 0 dropped


First I was reasonably impressed with `4294967290 unicast packets sent`
(system had been up for 20h), but looking closely, I read this as a
negative number of packets. Not being too familiar with the concept, I
thought only the particle physics community would come up with an
answer.
4294967290 apparently being (unsigned)-6, did I roll over my counters,
or is it just a secondary artifact and I should focus on the errors
reported in the first place?
Any hindsight on what might be causing this (or any good network
reference to consult) would be greatly appreciated. As expected, the
'singularity' punctually happened, and went away.

cheers,
Matthieu


-- 
Matthieu Bec              Gemini Observatory
Tel: +1 808 9742557       670 N. A'ohoku Place
Fax: +1 808 9359235       Hilo, Hawaii 96720, USA

Replies:
Re: making sense of peculiar ifShow report Andrew Johnson

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