[AGENT++] snmp++ request and response mismatch

[Frank Fock]

Hi,

I rather guess that there is an error in the target
agent (not the proxy) regarding lexicographic
ordering. The agent seems to compare OIDs by
string and not each sub-ID with a numeric
comparison.

Best regards,
Frank

On 25.08.2010 23:49, Jochen Katz wrote:
> Hi,
>
> for SNMPv2 such message mismatch should only occur if a request id is
> used twice, but this should be avoided by a mutex.
>
> Which proxy functionality do you use? I assume that you did define _SNMPv3.
>
> If you see an invalid response, do you get a timeout for another request?
>
> Is it possible to reproduce this with logging enabled and all log levels
> set to 15 for both client and proxy? For the client, please log the
> request id of the pdu after each call to Snmp::get/next...
>
> Regards,
>    Jochen
>
>
> Am 25.08.2010 11:29, schrieb Wang Fang:
>> I am using snmp++v3.2.24.tar.gz, agent++v3.5.30.tar.tar, crypt-1.17.tar.bz2,
>> libdes-l-4.01a.tar.gz, SNMPv2.
>> The requst:
>> requst id:1061
>> 1.3.6.1.4.1.2863.1.1.1.10.1.0
>> 1.3.6.1.4.1.2863.1.1.1.10.2.0
>> 1.3.6.1.4.1.2863.1.1.1.10.4.0
>> 1.3.6.1.4.1.2863.1.1.1.100.1.0
>>
>> The response:
>> request id:1061
>> 1.3.6.1.4.1.2863.1.1.1.11.1.0
>> 1.3.6.1.4.1.2863.1.1.1.11.2.0
>> 1.3.6.1.4.1.2863.1.1.1.11.3.0
>> 1.3.6.1.4.1.2863.1.1.1.11.5.0
>>
>> There is only one callback function, and the request oids is passed to
>> callback through the last parameter. The proxy is running in Ubuntu and it's
>> written with snmp++v3.2.24.tar.gz, agent++v3.5.30.tar.tar. The proxy works
>> fine with serial requests.
>>
>> On Wed, Aug 25, 2010 at 3:35 AM, Jochen Katz<katz at agentpp.com>  wrote:
>>
>>> Hi,
>>>
>>>> I am currently using snmp++ in vc++ 2008. In my app, multi-thread use the
>>>> same snmp instance to send async request to a snmp proxy. The snmp proxy
>>>> distribute the requests to separate agents and return the result to my
>>> app.
>>>> But sometimes the vb count returned in the callback function is different
>>> to
>>>> the vb count in the request. Is that a bug? How can I avoid it? Thanks.
>>>
>>> what version of snmp++ do you use? Maybe this does not occur with the
>>> latest version. For SNMPv3 message d creation was fixed in 3.2.23.
>>>
>>> In what way do the Vbs differ? Is the wrong callback called? Is there
>>> just one additional Vb? At the end or at the front? What is the Oid?
>>> Which proxy do you use? ... More details please...
>>>
>>> Regards,
>>>   Jochen
>>> _______________________________________________
>>> AGENTPP mailing list
>>> AGENTPP at agentpp.org
>>> http://lists.agentpp.org/mailman/listinfo/agentpp
>>>
>>
>>
>>
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