[SNMP4J] SNMP Buffer OverFlow Exception

[vinod]

Hi,

I was trying to get MIB data from machines through SNMP using snmp4j 
library. I am facing a problem where some times the machines are not 
responding to the SNMP query (even with high time out and retries).
But if i wait for some time (lets say 3-5 minutes) and again query the 
same machines (which earlier not responded), they are responding to the 
SNMP queries. I was using various Operating systems and i had observed 
that this type of problem is happening more in Windows 7 (may be its 
just a coincidence). Does any body face this sort of problem?

Thanks,
Vinod Kumar Boppanna
vinod wrote:
> Hi Frank,
>
> Thanks for the reply.  Sorry for very late reply.
>
> Actually, i was not doing any modification while sending the SNMP Request.
> After little inspection of the error it seems the snmp package was 
> trying to put a Byte data in the Buffer, but some how the data is larger 
> than a byte.
> We got this error when we were using the snmp4j-1.11.1.jar package. I 
> had moved from this one to the very latest one snmp4j-2.0.2.jar package.
>
> Till now, i have not faced the BufferOverflow Error. I guess the problem 
> is solved (any ways, i will test for few more days to be sure on this)
>
> Thanks once again for the reply.
>
> Regards,
> Vinod Kumar Boppanna
> Frank Fock wrote:
>   
>> Hi Vinod,
>>
>> You do not have to change anything on OS level.
>> With SNMP you cannot send packets that exceed 64K.
>> But I do not think that this is the problem here.
>> I guess that you modify the PDU contents while it
>> is being encoded. Have you checked that already?
>>
>> Best regards,
>> Frank
>>
>>
>> Am 18.11.2011 05:53, schrieb vinod:
>>   
>>     
>>> Hi,
>>>
>>> I am facing the Buffer OverFlow Exception when trying to do send a snmp
>>> packet. The Stack Trace is given below.
>>>
>>> java.nio.BufferOverflowException
>>>          at java.nio.Buffer.nextPutIndex(Buffer.java:513)
>>>          at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:163)
>>>          at org.snmp4j.asn1.BEROutputStream.write(BEROutputStream.java:64)
>>>          at org.snmp4j.asn1.BER.encodeHeader(BER.java:119)
>>>          at org.snmp4j.smi.Null.encodeBER(Null.java:99)
>>>          at
>>> org.snmp4j.smi.VariableBinding.encodeBER(VariableBinding.java:181)
>>>          at org.snmp4j.PDU.encodeBER(PDU.java:528)
>>>          at org.snmp4j.mp.MPv1.prepareOutgoingMessage(MPv1.java:132)
>>>          at
>>> org.snmp4j.MessageDispatcherImpl.sendPdu(MessageDispatcherImpl.java:444)
>>>
>>> I had increased all the memory limits in linux and still facing this
>>> problem very often. Kindly guide me in solving the problem.
>>>
>>> Thanks,
>>> Vinod Kumar Boppanna
>>>
>>> _______________________________________________
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>>> SNMP4J at agentpp.org
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>>>     
>>>       
>>   
>>     
>
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