[AGENT++] Error returned in the SNMPV3 PDU

[Frank Fock]

Hi,

I just want to add to Jochen's response, that the SNMP_ERROR_AUTH_ERR
is returned by AGENT++ when the VACM denies access to a particular object
instance.

Regards,
Frank Fock

Jochen Katz wrote:

> Hi,
>
>> I have a doubt about the manner in which the error is returned when a 
>> snmpV3 call is made.
>>  
>> Say for example if the manager issues a request to a agent with an 
>> incorrect security level,
>
>   ^^^^^^^^^^^^^^^^^^^^^^^^
>
> what exactly are you doing? Send an authPriv request using an user 
> that is only configured for authNoPriv at the agent? In this case you 
> should either receive a report with the "unsupported securityLevel" 
> counter or the local error code 1403 (also unsupported securityLevel) 
> while trying to encode the request.
>
> >  sometimes the error
>
>> SNMP_ERROR_AUTH_ERR         16 //!< Authentication failure
>>  
>> is returned by the call itself (by the snmp.get() method).
>
>
> I don't think, that this error is returned without contacting the 
> agent, as SNMP_ERROR_AUTH_ERR is not used directly within snmp++.
>
>> But certain other times for the same error, the call is a success, 
>> but the PDU type is REPORT_MSG and the error has to be obtained by 
>> examining the Oid.
>
>
>> Can you please explain what decides this behaviour.
>
>
> Possibly two different agents?
>
> Regards,
>   Jochen
>
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