RE: snmptrapd - unable to receive informs

I placed the engine id of the receiver in the trapsess cmd (-e engineid of receiver)
And this is what was failing.

If I remove the -e on the trapsess line - it works.

So is there any reason or condition that would require the -e engineid to be placed in the trapsess cmd?

Or can I remove this completely from my setup.



-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave Shield
Sent: Wednesday, June 29, 2011 3:39 AM
To: Joan Landry
Cc: [email protected]
Subject: Re: snmptrapd - unable to receive informs

On 28 June 2011 20:28, Joan Landry <[email protected]> wrote:
> It fails if (ISENGINEKNOWN(secEngineID, *secEngineIDLen) == FALSE)
>
> Even though the engine id is correct (it is the engine id of the snmpd server).

Ah!  That might start to explain things

If you are working with unacknowledged SNMPv3 traps, then the authoritative
engine ID (as used in the PDU) is the engine ID of the *sender* (i.e. snmpd)
But with SNMPv3 _inform_ notifications, the authoritative engine ID is that
of the notification *receiver*  (i.e. snmptrapd)


> So it as if snmptrapd does not know its own engine id when processing an incoming inform packet.

But you've just said that it's using the engine ID of snmpd.
So things are *not* using it's  [snmptrapd's] own engine ID
(although they should be).

That's why I suggested removing the explicit engineID from the trapsess line,
to force snmpd to probe for it.

An alternative approach is to pick an engine ID, and specify this
explicitly for *both*
the trapsess line (in snmpd.conf) *and* the createUser line (in snmptrapd.conf).
That way, both sides of the conversation are using the same engine ID,
and things
should work OK.

Dave

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