Re: [SNMP4J] V2 Trap Packet Fragmentation
Dear Frank,
I hope all you are doing fine , well Mr frank with snmp4j when i try to
enregister the system description i get the *exception duplicate
registration *
*here is what i have added : *public static final OID sysdescr = new
OID(new int[] { 1,3,6,1,2,1,1,1,0});
*Here is the Exception name :*
org.snmp4j.agent.DuplicateRegistrationException
as it seems that the agent has taken this oid and has saved a value on it ,
do you a solution so we can unregister these defautlt
values so we can put new values instead ?
Hope to get a prompt reply .
Best regards .
___
SNMP4J mailing list
SNMP4J@agentpp.org
http://lists.agentpp.org/mailman/listinfo/snmp4j
Re: [SNMP4J] V2 Trap Packet Fragmentation
Thanks for the response, Frank. I was bit surprised by NPE since we are getting it only on one system. I fixed the SNMP4J code in our environment for Null check and the problem went away. We are investigating our code in more detail and initial investigation reveals that there is SNMP get request coming almost at the same time, which could be causing the NPE here, its not clear how the PDUs (trap and get) are clashing at this point though. Isnt it safe to check Null at line 499? Thanks. On Wed, Apr 18, 2012 at 6:50 PM, Frank Fock f...@agentpp.com wrote: Hi, Another user pointed me to the fact that you probalby using SNMP4J 1.x. In that case line 499 uses the variable binding list Vector of the PDU. If you get a NPE there, then you have set the list to null. You will have to fix that. Best regards, Frank Am 17.04.2012 23:20, schrieb Frank Fock: Hi, A NullPointerException at that location can be caused only by a NULL request ID. How you managed to be NULL - I don't know. Normally, SNMP4J takes care to set it. So you must have done something special. A SNMP packet fragementation does not exists on UDP level in the way you described it (two packets with their own header). Best regards, Frank Am 17.04.2012 00:12, schrieb Amol Rao: ...any thoughts? anyone? On Mon, Apr 16, 2012 at 4:09 PM, Amol Raoxamol...@gmail.com wrote: I see the following exception when trap is being sent out. Any pointers? java.lang.NullPointerException at org.snmp4j.PDU.getBERPayloadLengthPDU(PDU.java:499) at org.snmp4j.PDU.getBERLength(PDU.java:436) at org.snmp4j.mp.MPv2c.prepareOutgoingMessage(MPv2c.java:118) at org.snmp4j.MessageDispatcherImpl.sendPdu(MessageDispatcherImpl.java:444) at org.snmp4j.Snmp.sendMessage(Snmp.java:1078) at org.snmp4j.Snmp.send(Snmp.java:878) at org.snmp4j.Snmp.send(Snmp.java:871) at org.snmp4j.Snmp.send(Snmp.java:836) at org.snmp4j.Snmp.notify(Snmp.java:780) Cheers, Amol On Mon, Apr 16, 2012 at 1:05 PM, Amol Raoxamol...@gmail.com wrote: Hi All: Just wanted to reach out and see if anyone encountered this situation. I am sending out an SNMP trap (~1K size) from an agent system. When manager receives the trap, its observe that its divided into multiple traps and each trap carries one variable binding - which leads to conclusion that the packets are getting fragmented at the SNMP level, I wonder why this happens. I did wireshark and realized that there is no UDP level fragmentation. Both source (trap generation) and Destination (trap receiver) uses snmp4j-1.11.jar but since on the receiving side, I have logic that expects the trap to come in as one UDP packets, the whole thing breaks apart. Moreover, I observed that its happening on only one system, the same code works on another identical system. Any pointers as to why this could be happening and what is the way around? I am pretty sure that we are not crossing UDP packet limit, not that it would matter at SNMP layer. Thanks. Cheers, Amol ___ SNMP4J mailing list SNMP4J@agentpp.org http://lists.agentpp.org/mailman/listinfo/snmp4j -- --- AGENT++ Maximilian-Kolbe-Str. 10 73257 Koengen, Germany https://agentpp.com Phone: +49 7024 8688230 Fax: +49 7024 8688231 ___ SNMP4J mailing list SNMP4J@agentpp.org http://lists.agentpp.org/mailman/listinfo/snmp4j ___ SNMP4J mailing list SNMP4J@agentpp.org http://lists.agentpp.org/mailman/listinfo/snmp4j
Re: [SNMP4J] V2 Trap Packet Fragmentation
Hi, A NullPointerException at that location can be caused only by a NULL request ID. How you managed to be NULL - I don't know. Normally, SNMP4J takes care to set it. So you must have done something special. A SNMP packet fragementation does not exists on UDP level in the way you described it (two packets with their own header). Best regards, Frank Am 17.04.2012 00:12, schrieb Amol Rao: ...any thoughts? anyone? On Mon, Apr 16, 2012 at 4:09 PM, Amol Raoxamol...@gmail.com wrote: I see the following exception when trap is being sent out. Any pointers? java.lang.NullPointerException at org.snmp4j.PDU.getBERPayloadLengthPDU(PDU.java:499) at org.snmp4j.PDU.getBERLength(PDU.java:436) at org.snmp4j.mp.MPv2c.prepareOutgoingMessage(MPv2c.java:118) at org.snmp4j.MessageDispatcherImpl.sendPdu(MessageDispatcherImpl.java:444) at org.snmp4j.Snmp.sendMessage(Snmp.java:1078) at org.snmp4j.Snmp.send(Snmp.java:878) at org.snmp4j.Snmp.send(Snmp.java:871) at org.snmp4j.Snmp.send(Snmp.java:836) at org.snmp4j.Snmp.notify(Snmp.java:780) Cheers, Amol On Mon, Apr 16, 2012 at 1:05 PM, Amol Raoxamol...@gmail.com wrote: Hi All: Just wanted to reach out and see if anyone encountered this situation. I am sending out an SNMP trap (~1K size) from an agent system. When manager receives the trap, its observe that its divided into multiple traps and each trap carries one variable binding - which leads to conclusion that the packets are getting fragmented at the SNMP level, I wonder why this happens. I did wireshark and realized that there is no UDP level fragmentation. Both source (trap generation) and Destination (trap receiver) uses snmp4j-1.11.jar but since on the receiving side, I have logic that expects the trap to come in as one UDP packets, the whole thing breaks apart. Moreover, I observed that its happening on only one system, the same code works on another identical system. Any pointers as to why this could be happening and what is the way around? I am pretty sure that we are not crossing UDP packet limit, not that it would matter at SNMP layer. Thanks. Cheers, Amol ___ SNMP4J mailing list SNMP4J@agentpp.org http://lists.agentpp.org/mailman/listinfo/snmp4j -- --- AGENT++ Maximilian-Kolbe-Str. 10 73257 Koengen, Germany https://agentpp.com Phone: +49 7024 8688230 Fax: +49 7024 8688231 ___ SNMP4J mailing list SNMP4J@agentpp.org http://lists.agentpp.org/mailman/listinfo/snmp4j
[SNMP4J] V2 Trap Packet Fragmentation
Hi All: Just wanted to reach out and see if anyone encountered this situation. I am sending out an SNMP trap (~1K size) from an agent system. When manager receives the trap, its observe that its divided into multiple traps and each trap carries one variable binding - which leads to conclusion that the packets are getting fragmented at the SNMP level, I wonder why this happens. I did wireshark and realized that there is no UDP level fragmentation. Both source (trap generation) and Destination (trap receiver) uses snmp4j-1.11.jar but since on the receiving side, I have logic that expects the trap to come in as one UDP packets, the whole thing breaks apart. Moreover, I observed that its happening on only one system, the same code works on another identical system. Any pointers as to why this could be happening and what is the way around? I am pretty sure that we are not crossing UDP packet limit, not that it would matter at SNMP layer. Thanks. Cheers, Amol ___ SNMP4J mailing list SNMP4J@agentpp.org http://lists.agentpp.org/mailman/listinfo/snmp4j
Re: [SNMP4J] V2 Trap Packet Fragmentation
...any thoughts? anyone? On Mon, Apr 16, 2012 at 4:09 PM, Amol Rao xamol...@gmail.com wrote: I see the following exception when trap is being sent out. Any pointers? java.lang.NullPointerException at org.snmp4j.PDU.getBERPayloadLengthPDU(PDU.java:499) at org.snmp4j.PDU.getBERLength(PDU.java:436) at org.snmp4j.mp.MPv2c.prepareOutgoingMessage(MPv2c.java:118) at org.snmp4j.MessageDispatcherImpl.sendPdu(MessageDispatcherImpl.java:444) at org.snmp4j.Snmp.sendMessage(Snmp.java:1078) at org.snmp4j.Snmp.send(Snmp.java:878) at org.snmp4j.Snmp.send(Snmp.java:871) at org.snmp4j.Snmp.send(Snmp.java:836) at org.snmp4j.Snmp.notify(Snmp.java:780) Cheers, Amol On Mon, Apr 16, 2012 at 1:05 PM, Amol Rao xamol...@gmail.com wrote: Hi All: Just wanted to reach out and see if anyone encountered this situation. I am sending out an SNMP trap (~1K size) from an agent system. When manager receives the trap, its observe that its divided into multiple traps and each trap carries one variable binding - which leads to conclusion that the packets are getting fragmented at the SNMP level, I wonder why this happens. I did wireshark and realized that there is no UDP level fragmentation. Both source (trap generation) and Destination (trap receiver) uses snmp4j-1.11.jar but since on the receiving side, I have logic that expects the trap to come in as one UDP packets, the whole thing breaks apart. Moreover, I observed that its happening on only one system, the same code works on another identical system. Any pointers as to why this could be happening and what is the way around? I am pretty sure that we are not crossing UDP packet limit, not that it would matter at SNMP layer. Thanks. Cheers, Amol ___ SNMP4J mailing list SNMP4J@agentpp.org http://lists.agentpp.org/mailman/listinfo/snmp4j
