Re: SNMPv3 works for about an hour and then stops working C490567

Dave Shield <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>
2009/2/17 Jeff Silverman <[email protected]>:
> I have a customer who is using Zenos and SNMPv3 to poll a pair of embedded
> machines that are running  net-snmp-5.0.9 .....  I have packet
> captures in wireshark that show that one unit is replying with "report
> SNMP-USER-BASED-SM-MIB:usmStatsNotInTimewindows.0"

> My hypothesis is that the NMS and the snmpd engineIDs are getting out of
> sync for some reason.

A 'notInTimeWindow' report isn't concerned with the engineID value.
It's related to the values of the 'snmpEngineBoots' and 'snmpEngineTime'
fields in the SNMPv3 request.
   See RFC 3414, sections 2.2, 2.3 and 3.2 step 7) for a full description.


Have a look at the wireshark trace for the two or three request/response
pairs immediately before the point where the agent stops responding.
What are the engineBoot/Time values here?

What are these value in the request that triggered the notInTimeWindow report.
and the report itself?

What about in the traffic immediately afterwards?

That might give some indication as to what might be going wrong.

Dave

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