[snmp] Recieved Engine ID is not correct

[tausif tausif]

Hi  Birgit,

Thanks for the reply.
I have few more doubts regarding the same. 
I think after re-installation of snmp engine it is possble of getting set the different engineid. and in this case the engine boots value will get assign to 1 and time must be zero? (please correct me if i m wrong) i have not seen the time-stamp value in NET-SNMP's conf files though.

in this case my snmp-manager should not treat it as unauthorized packet/call and should process my request. I checked the TimeWindow.isEngineIdOK() code which just match the engineid and does not bother about the engineBoots and timeStamp. Should't it check thess variablesz as well? I think if we check these variables as well, our code should work fine?

Waiting for your response
Thanks & regards
Tausif



On Mon, 26 Mar 2007 Birgit Arkesteijn wrote :
>Hi Tausif,
>
>When using SNMPv3, the stack discovers the engineId by asking the
>authoritative engine for it. If authentication or privacy is used, it
>will then ask for the timeline details as well.
>
>It does this once at the beginning. (It will repeat it only when
>unsuccessful.) The details are stored for the remaining of the stack
>lifetime.
>
>In your case, the stack complains that the discovered engineId and the
>one sent (by the authoritative engine) as part of a subsequent request
>are not the same.
>
>However, you said so yourself: there is a mis-match.
>
>The engineId is supposed to uniquely identify an authoritative engine,
>i.e. it's not supposed to change.
>
>The only option I see is to stop/start the stack.
>
>If that doesn't work:
>Call AsnObject.setDebug(5), the stack will then print the engineId (and
>timeline details if using authentication or privacy) it stores.  See
>what you get when doing discovery.
>
>Cheers, Birgit
>
>
>On Mon, Mar 26, 2007 at 04:04:56PM +0530, tausifk wrote:
> > All,
> >
> > I am getting an exception - "Received engine Id ('80001F88800C330000999E0746') is not correct"
> >
> > The scenario is, I run my snmp manager (Westhawk API) and fetched the snmpv3 information from an Net-SNMP agent running on a particular device. Now my manager is still up and running and I re-install the Net-SNMP agent and configure the same user with same credentials as before. Now I again try to do snmpv3 ping and get this exception:
> >
> > =================================================================================
> > snmpgetV3.start() PduException: Received engine Id ('80001F88800C330000999E0746') is not correct. amIAuthoritative == false
> > snmpgetV3.start() PduException:
> > uk.co.westhawk.snmp.stack.DecodingException: Received engine Id ('80001F88800C330000999E0746') is not correct. amIAuthoritative == false
> >  at uk.co.westhawk.snmp.stack.AsnDecoderv3.processSNMPv3(AsnDecoderv3.java:176)
> >  at uk.co.westhawk.snmp.stack.SnmpContextv3Basis.processIncomingResponse(SnmpContextv3Basis.java:812)
> >  at uk.co.westhawk.snmp.stack.AbstractSnmpContext.run(AbstractSnmpContext.java:545)
> >  at java.lang.Thread.run(Thread.java:534)
> >
> > =================================================================================
> >
> >
> > I understand that the re-installation of Net-SNMP agent re-generate the engine-id and my snmp manager cached the engine-ID before when I did snmpv3 ping and there is a mis-match.
> >
> > Please do let me know is there any bug with SNMP-Westhawk API or it is a wrong behaviour of Net-SNMP agent which is re-generating the different engine-id?
> >
> > I am using Westhawk SNMP 5.1 version for my snmp Manager.
> >
> > Thanks in advance
> > Tausif
> >
> > _______________________________________________
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> > snmp at snmp.westhawk.co.uk
> > http://snmp.westhawk.co.uk/mailman/listinfo/snmp
>
>--
>-- Birgit Arkesteijn, birgit at westhawk.co.uk,
>-- Westhawk Ltd, Albion Wharf, 19 Albion Street, Manchester M1 5LN, UK
>-- Company no: 1769350
>-- Registered Office:
>-- 15 London Road, Stockton Heath, Warrington WA4 6SJ. UK.
>-- tel.: +44 (0)161 237 0660
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