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SNMP monitoring, ID changes

Taomyn
Hi,

I'm using PRTG to monitor my UTM box with SNMP, I have imported the MIB and lots of sensors are generated and all seem to work fine. However, when I restart UTM or if my DSL connection goes down/up, the ID for tun0 and ppp0 get changed and so PRTG starts throwing alerts.

For example, the other my DSL went down for about five minutes and when it came back PRTG showed



I looked on UTM in Advanced and my interfaces showed:



So ppp0 had gone from 8 to 18 and tun0 from 11 (ignore the 12 from earlier as it's just a label I forgot to update from last time this happened) to 19

I therefore reboot UTM and this time interfaces showed:



Both had reverted and so PRTG was fine:



I'm on 9.312-8 but before on 9.310 this happened every time UTM was rebooted, though it seems that's been fixed in 9.312 and reboots don't appear to change them.

Any ideas how I can prevent the IDs from changing or is it a bug?


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  • 0
    Not really a bug per se.  During a reboot or down/up event the virtual adapters also reset.  The old entries in the table this information is stored in hadn't yet been completely purged, which is done at a timed interval, not instantly.  Basically. the old fields had already been blanked, but the fields themselves were still waiting to be removed.
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  • 0

    I have experienced the same "feature" with my Sophos UTM and PRTG, although I didn't know a reboot of the UTM would revert it to its "original" interface ID.

    I was troubleshooting an issue today and disabled and re-enabled a virtual interface and PRTG shows it as being down "no such instance". What is the timeout for it to revert on its own?

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