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Netopia 3347 - SNMP Traffic Monitoring Problem

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    #2
    Alun
    Registered Users Posts: 21,467 ✭✭✭✭Alun


    Possibly some kind of problem involving an overflowing 32-bit counter I'd wager.

    Here's an FAQ for the program I use to monitor my SNMP stats that explains the problem ...

    http://www.paessler.com/support/kb/questions/113/


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    #3
    Alun
    Registered Users Posts: 21,467 ✭✭✭✭Alun


    BTW the best way to debug it would be to somehow regularly dump the values for the following variables somewhere around the time you are noticing this effect and look for any anomalies such as overflowing counters (which odmon should compensate in fairness) or maybe some strange hiccups in sysUpTime. Traffic rates are calculated by subtracting the previous value from the most recent one and dividing by the elapsed time (again calculate by subtracting values for sysUpTime). Maybe odmon itself allows you to somehow look at the raw data it uses, I'm not familiar with it, otherwise you may have to do something home brewed with a cmdline snmp(get) program in a loop in a batch file.

    {1.3.6.1.2.1.1.3.0} iso.org.dod.internet.mgmt.mib-2.system.sys UpTime

    {1.3.6.1.2.1.2.2.1.10.x} iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.if InOctets

    {1.3.6.1.2.1.2.2.1.16.x} iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.if OutOctets

    (replace x with the relevant interface number for your router)


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