[SNMP4J] Unsupported PDU type

[Frank Fock]

You can yourself “sniff” into incoming packets using a TransportListener and then change (fix) the PDU type on-the-fly in the message byte stream. Afterwards, SNMPJ4 will accept the PDU.


> On 5. Apr 2017, at 22:23, Yuri Krysko <Yuri.Krysko at mcdean.com> wrote:
> 
> Thank you Frank! I thought of it as well. It looks like one of the SNMP
> clients that I am listening for traps from is badly implemented. Is there
> any way to ignore this message and/or force snmp4j to process the trap as
> SNMPv1 if the client sends such rogue messages?
> 
> I used wireshark to sniff communications between my IDE and remote SNMP
> client, and I can confirm this nonsense: the trap comes as v2c, but it is
> actually V1TRAP type.
> 
> On 4/5/17, 4:03 PM, "Frank Fock" <fock at agentpp.com <mailto:fock at agentpp.com>> wrote:
> 
>> Hi Yuri,
>> 
>> The PDU is a v2c PDU which does not allow SNMPv1 TRAP!
>> 
>> Best regards,
>> Frank
>> 
>>> On 5. Apr 2017, at 17:37, Yuri Krysko <Yuri.Krysko at mcdean.com> wrote:
>>> 
>>> Hello All,
>>> 
>>> I am getting the following IOException when trying to decode received
>>> SNMP trap
>>> 
>>> 
>>> java.io.IOException: Unsupported PDU type: -92
>>> 
>>> at org.snmp4j.PDU.decodeBER(PDU.java:566)
>>> 
>>> at org.snmp4j.mp.MPv2c.prepareDataElements(MPv2c.java:201)
>>> 
>>> at
>>> org.snmp4j.MessageDispatcherImpl.dispatchMessage(MessageDispatcherImpl.ja
>>> va:278)
>>> 
>>> at
>>> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.jav
>>> a:387)
>>> 
>>> at
>>> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.jav
>>> a:347)
>>> 
>>> at
>>> org.snmp4j.util.MultiThreadedMessageDispatcher$MessageTask.run(MultiThrea
>>> dedMessageDispatcher.java:182)
>>> 
>>> at org.snmp4j.util.ThreadPool$TaskManager.run(ThreadPool.java:260)
>>> 
>>> 
>>> To my knowledge, PDU type -92 is supported and denotes V1TRAP. Could
>>> anyone advise?
>>> 
>>> Thanks !
>>> 
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> 
> 
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