[mrtg] SNMPWALK Problem for on cross-compiled mrtg (openwrt mipsbe)

Steve Shipway s.shipway at auckland.ac.nz
Sat Jan 23 21:41:18 CET 2010

I hope no offense was taken from my previous reply to Brandon.  I merely meant the root of the problem lies somewhere after MRTG calls SNMP_util - I had not time to investigate any further down and pinpoint the issue to the SNMP_Session module underneath.
If the issue can be solved by  adding these extra options to make requests compatible with the target agent then this would be a good solution nd is worth remembering for future problem that may crop up.


From: Mike Mitchell [Mike.Mitchell at sas.com]
Sent: Saturday, 23 January 2010 4:56 a.m.
To: Brandon Miller; Steve Shipway
Cc: mrtg at lists.oetiker.ch
Subject: RE: [mrtg] SNMPWALK Problem for on cross-compiled mrtg (openwrt mipsbe)

As the author of SNMP_util.pm I strongly disagree that the problem lies with the SNMP_util module.
The SNMP_util.pm module does not do any SNMP queries on its own, rather it calls Simon Leinen’s SNMP_Session module to do all socket I/O.  In private email I suggested Brandon Miller use 16-bit SNMP request IDs (--use-16bit on cfgmaker) and to enable ‘avoid_negative_request_ids’, but he did not respond.

Mike Mitchell

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