[SNMP4J] can't process negative 32-bit int boundary value in response?

[Choi, Andy]

Frank,

Thanks for your reply.

I am probably not explaining the problem correctly...

Here is an example of what is happening:

MyApp sends a BulkGet request from pollerhost to targethost with timeout
of 10 seconds via the Snmp.send(Pdu, Target) method.

A capture using tcpdump shows a response is returned immediately:

17:18:01.564390 IP pollerhost.36521 > targethost.snmp:  GetBulk(35)  N=0
M=10 E:8940.2.3.2.1.27.1.82.2
17:18:01.627272 IP targethost.snmp > pollerhost.36521:  GetResponse(255)
E:8940.2.3.2.1.27.1.83.2=6753395 E:8940.2.3.2.1.27.1.84.2=36952
E:8940.2.3.2.1.27.1.85.2=283351685 E:8940.2.3.2.1.27.1.86.2=1550403
E:8940.2.3.2.1.27.1.87.2=-2147483648 E:8940.2.3.2.1.27.1.88.2=1454456832
E:8940.2.3.2.1.27.1.89.2=13 E:8940.2.3.2.1.27.1.90.2=9941
E:8940.2.3.2.1.27.1.91.2=566587 E:8940.2.3.2.1.27.1.92.2=8645

But the ResponseEvent.getResponse() method never returns the response
PDU object and does not throw an Exception, but instead it times out
after 10 seconds and returns a null.

After some playing around, I found out this error only happens when the
87.2 OID is included in the response.  The tcpdump output shows the data
value for the 87.2 OID in the response is -2147483648 (or sometimes 0).

I can issue the same request using NET-SNMP snmpbulkget, and it
processes the response fine (shows 87.2=0 in the output).

Please let me know if this is a bug, and if so, how to submit it.

Best Regards,
Andy

-----Original Message-----
From: snmp4j-bounces at agentpp.org [mailto:snmp4j-bounces at agentpp.org] On
Behalf Of Frank Fock
Sent: Friday, April 16, 2010 12:37 PM
To: snmp4j at agentpp.org
Subject: Re: [SNMP4J] can't process negative 32-bit int boundary value
in response?

Andy,

If the request contains also -2147483648, there
is no problem. If not, then it works as designed.
(request and response PDUs are matched their
request ID).

Best regards,
Frank

On 16.04.2010 08:43, Choi, Andy wrote:
> Hello,
>
>
>
> I have run into a possible bug where a tcpdump shows that a response
PDU
> is being returned with an integer varbind whose value is -2147483648,
> but SNMP4J is apparently unable to finish processing the PDU and
instead
> is timing out on the response.  Can somebody confirm that this is a
bug?
> I would think that it should at least throw an Exception instead of
> timing out.
>
>
>
> Thanks,
>
> Andy
>
>
>
>
>
>
>
>
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