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Thread: Intermittent SNMP errors in 12.10

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  1. #1
    Join Date
    Dec 2007
    Lincoln, NE

    Question Intermittent SNMP errors in 12.10

    I have an old RHEL3 box on my network which I monitor via SNMP from my Ubuntu server running MRTG. I've been doing this for years with continually-updated versions of 32-bit Ubuntu, and have never had problems.

    Over the long New Years weekend, I replaced my 32-bit 12.04 install with a fresh 64-bit 12.10 install. The SNMP & MRTG configs were copied from the 12.04 install (on a separate drive, so it's still accessible). Ever since then, I've been getting intermittent connectivity errors with SNMP to the RHEL server ("yavin"). MRTG polls every 5 minutes, and most of the time, it succeeds. It fails at variable intervals ranging from 10 minutes to 4 hours, but probably averaging one failure every 30 minutes. Here's the error message I'm emailed each time:

    SNMP Error:
    no response received
    SNMPv1_Session (remote host: "yavin" [].161)
    community: "undisclosed"
    request ID: 2110321503
    PDU bufsize: 8000 bytes
    timeout: 5s
    retries: 5
    backoff: 1)
    at /usr/share/perl5/ line 492
    SNMPGET Problem for ifInOctets.2 ifOutOctets.2 sysUptime sysName on undisclosed@yavin::::::v4only at /usr/bin/mrtg line 2339
    2013-01-04 09:15:01: WARNING: skipping because at least the query for ifInOctets.2 on yavin did not succeed
    2013-01-04 09:15:01: WARNING: no data for ifInOctets&ifOutOctets:undisclosed@yavin. Skipping further queries for Host yavin in this round.
    2013-01-04 09:15:30: ERROR: Target[yavin-eth0][_IN_] ' $target->[28]{$mode} * 8' (warn): Use of uninitialized value in multiplication (*) at (eval 74) line 1.
    2013-01-04 09:15:30: ERROR: Target[yavin-eth0][_OUT_] ' $target->[28]{$mode} * 8' (warn): Use of uninitialized value in multiplication (*) at (eval 75) line 1.

    All further queries to yavin for that round of MRTG also fail. The SNMP line from MRTG is pretty straightforward, and works most of the time:

    Target[yavin-eth0]: ifInOctets.2&ifOutOctets.2:undisclosed@yavin * 8

    Logs on yavin don't show anything. /etc/snmp/snmp.conf on the Ubuntu box contains only comments. This worked 100% of the time before the Ubuntu 12.10 upgrade, so I don't believe it's a hardware problem.

    Any ideas what's going on?
    Last edited by Obi-Wan-YJ; January 4th, 2013 at 04:42 PM. Reason: formatting

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