[SNMP4J] Empty SNMP Packets send to Agent
Frank Fock
fock at agentpp.com
Wed Dec 16 20:35:12 CET 2015
Hi Daniel,
a log on DEBUG level of the SNMP4J application would be more helpful.
There we could see the if the response arrived in time or not.
What timeout value are you using? It seems that it is by far too small...
Have you cut the response packet? The dump you quoted reports a
truncated PDU which could have violate the standard and therefore dropped
with an error logged in the SNMP4J log.
Best regards,
Frank
Am 16.12.2015 um 09:38 schrieb Daniel Frank:
> Hello,
>
> I'm sorry that I didn't provide any further information for the problem.
>
> This is what I captured with Wireshakr for one set-request which successfully set the property
> on the network component:
>
> No. Time Source Destination Protocol Length Info
> 41 5.404718000 10.2.1.21 10.2.1.240 SNMP 195 set-request 1.3.6.1.4.1.9.9.513.1.7.4.1.1.12.104.3.3.149.208
>
> Frame 41: 195 bytes on wire (1560 bits), 195 bytes captured (1560 bits) on interface 0
> Ethernet II, Src: WistronI_97:0f:b7 (3c:97:0e:97:0f:b7), Dst: CiscoInc_e0:60:05 (e0:ac:f1:e0:60:05)
> Internet Protocol Version 4, Src: 10.2.1.21 (10.2.1.21), Dst: 10.2.1.240 (10.2.1.240)
> User Datagram Protocol, Src Port: 65210 (65210), Dst Port: 161 (161)
> Simple Network Management Protocol
> msgVersion: snmpv3 (3)
> msgGlobalData
> msgID: 1237400771
> msgMaxSize: 65535
> msgFlags: 07
> .... .1.. = Reportable: Set
> .... ..1. = Encrypted: Set
> .... ...1 = Authenticated: Set
> msgSecurityModel: USM (3)
> msgAuthoritativeEngineID: 00003763000060006406a8c0
> 0... .... = Engine ID Conformance: RFC1910 (Non-SNMPv3)
> Engine Enterprise ID: Airespace, Inc (formerly 'Black Storm Networks') (14179)
> AgentID Trailer: 0x000060006406a8c0
> msgAuthoritativeEngineBoots: 1
> msgAuthoritativeEngineTime: 1952429
> msgUserName: SecTestUser
> msgAuthenticationParameters: 4739f56e8828a1b8857127d4
> [Authentication: OK]
> [Expert Info (Chat/Checksum): SNMP Authentication OK]
> [SNMP Authentication OK]
> [Severity level: Chat]
> [Group: Checksum]
> msgPrivacyParameters: 53d380fb215c5e78
> msgData: encryptedPDU (1)
> encryptedPDU: 95d0aa3fcf935f4ba649678b9d81fee6912d0b1fe93e8e4c...
> Decrypted ScopedPDU: 303d040c00003763000060006406a8c00400a32b0204164d...
> contextEngineID: 00003763000060006406a8c0
> 0... .... = Engine ID Conformance: RFC1910 (Non-SNMPv3)
> Engine Enterprise ID: Airespace, Inc (formerly 'Black Storm Networks') (14179)
> AgentID Trailer: 0x000060006406a8c0
> contextName:
> data: set-request (3)
> set-request
> request-id: 374145296
> error-status: noError (0)
> error-index: 0
> variable-bindings: 1 item
> 1.3.6.1.4.1.9.9.513.1.7.4.1.1.12.104.3.3.149.208:
> Object Name: 1.3.6.1.4.1.9.9.513.1.7.4.1.1.12.104.3.3.149.208 (iso.3.6.1.4.1.9.9.513.1.7.4.1.1.12.104.3.3.149.208)
> Value (Integer32): 2
>
> No. Time Source Destination Protocol Length Info
> 42 5.405533000 10.2.1.240 10.2.1.21 SNMP 194 get-response 1.3.6.1.4.1.9.9.513.1.7.4.1.1.12.104.3.3.149.208
>
> Frame 42: 194 bytes on wire (1552 bits), 194 bytes captured (1552 bits) on interface 0
> Ethernet II, Src: CiscoInc_e0:60:00 (e0:ac:f1:e0:60:00), Dst: WistronI_97:0f:b7 (3c:97:0e:97:0f:b7)
> Internet Protocol Version 4, Src: 10.2.1.240 (10.2.1.240), Dst: 10.2.1.21 (10.2.1.21)
> User Datagram Protocol, Src Port: 161 (161), Dst Port: 65210 (65210)
> Simple Network Management Protocol
> msgVersion: snmpv3 (3)
> msgGlobalData
> msgID: 1237400771
> msgMaxSize: 4096
> msgFlags: 03
> .... .0.. = Reportable: Not set
> .... ..1. = Encrypted: Set
> .... ...1 = Authenticated: Set
> msgSecurityModel: USM (3)
> msgAuthoritativeEngineID: 00003763000060006406a8c0
> 0... .... = Engine ID Conformance: RFC1910 (Non-SNMPv3)
> Engine Enterprise ID: Airespace, Inc (formerly 'Black Storm Networks') (14179)
> AgentID Trailer: 0x000060006406a8c0
> msgAuthoritativeEngineBoots: 1
> msgAuthoritativeEngineTime: 1952429
> msgUserName: SecTestUser
> msgAuthenticationParameters: 6c42ce550b043adda25bb7cb
> [Authentication: OK]
> [Expert Info (Chat/Checksum): SNMP Authentication OK]
> [SNMP Authentication OK]
> [Severity level: Chat]
> [Group: Checksum]
> msgPrivacyParameters: a022f203000000b8
> msgData: encryptedPDU (1)
> encryptedPDU: dd04f0158d06e1337c7f3a69a56d4c423794a0099c8998c5...
> Decrypted ScopedPDU: 303d040c00003763000060006406a8c00400a22b0204164d...
> contextEngineID: 00003763000060006406a8c0
> 0... .... = Engine ID Conformance: RFC1910 (Non-SNMPv3)
> Engine Enterprise ID: Airespace, Inc (formerly 'Black Storm Networks') (14179)
> AgentID Trailer: 0x000060006406a8c0
> contextName:
> data: get-response (2)
> get-response
>
> The request is sent like this:
> ResponseEvent response = snmp.set(pdu, target);
>
> The ResponseEvent is not empty, but when I try to get the PDU via
> response.getResponse() it is null.
>
> And I need to evaluate the response to tell the user, if it was successful or not.
>
> The ID seems to be ok.
>
> Thanks for your help in advance.
>
> Best regards,
> Daniel
>
> -----Ursprüngliche Nachricht-----
> Von: SNMP4J [mailto:snmp4j-bounces at agentpp.org] Im Auftrag von Jochen Katz
> Gesendet: Montag, 14. Dezember 2015 18:59
> An: snmp4j at agentpp.org
> Betreff: Re: [SNMP4J] Empty SNMP Packets send to Agent
>
> Hello,
>
>> Now I have another problem. I do some set requests and the values are
>> set successfully, but the response parameter of the ResponseEvent is
>> always null.
>>
>> What could be the problem there? In Wireshark I can see the response
>> with all necessary informations about the successful action.
> without some log information it is difficult to find the cause of this.
> Either the response cannot be matched to request (SNMPv3 message id does not match) or the response contains wrong or none SNMPv3 time information or something completely different.
>
> Regards,
> Jochen
>
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