[SNMP4J] net-snmp and snmp4j agentx
Rob Morton
rob.d.morton at alcatel-lucent.com
Thu Jun 7 19:05:28 CEST 2012
Hi Frank,
I built net-snmp 5.5.1 and tried it...it worked fine.
Thanks for your assistance. :-)
Regards,
Rob
On 6/7/2012 9:44 AM, Rob Morton wrote:
> Hi Frank,
>
> I will upgrade to net-snmp 5.5 and try it with that version.
>
> Thank you :-)
>
> Regards,
> Rob
>
> On 6/6/2012 5:51 PM, Frank Fock wrote:
>> Hi Rob,
>>
>> Bad news, it seems that this is simply a memory allocation bug in
>> NET-SNMP. NET-SNMP 5.0.9 is very old and there are a lot of fixes
>> regarding AgentX in newer versions. Are you able to upgrade?
>>
>> Best regards,
>> Frank
>>
>> Am 06.06.2012 19:43, schrieb Rob Morton:
>>> Hi Frank,
>>>
>>> First, thank you very much for looking into this issue. It is
>>> very much appreciated.
>>>
>>> Second, I have attached a master agent log(I use log4j too and
>>> had to connect in your logsnmp4jfactory)...it shows the agent
>>> starting up and the log messages generated as a result of the
>>> net-snmp starting up and connecting then registering its MIB
>>> regions...later in the log...it then reflects DEBUG info when I send
>>> in the snmpget for the ifNumber OID as stated earlier in this email
>>> thread.
>>>
>>> I removed my server's log entries as best I could but there might
>>> still be a few entries reflecting my code...it will be prefixed with
>>> com.alcatel.tpapps.*
>>>
>>> Thanks,
>>> Rob
>>>
>>> On 6/6/2012 11:55 AM, Frank Fock wrote:
>>>> Hi Rob,
>>>>
>>>> The log of the sub-agent shows, that there is probably a region
>>>> issue. To get the root cause, the log of the master agent is very
>>>> important.
>>>>
>>>> It is likely, that we can find a workaround for that issue.
>>>> NET-SNMP cannot handle big sub OIDs (between 2^31
>>>> and 2^32-1) in registrations/requests correctly in all
>>>> situations.
>>>>
>>>> Best regards,
>>>> Frank
>>>>
>>>> Am 06.06.2012 15:47, schrieb Rob Morton:
>>>>> Hi Frank,
>>>>>
>>>>> Thank you for responding...
>>>>>
>>>>> Here are the details of the issue I'm facing:
>>>>>
>>>>> * I am using net-snmp v5.0.9 on Solaris 10 configured as a
>>>>> sub-agent to my AgentXMasterAgent-based master agent via the
>>>>> command:
>>>>>
>>>>> /usr/sfw/sbin/snmpd -X -DALL
>>>>>
>>>>> * with /etc/sma/snmp/snmpd.conf having the following entries:
>>>>>
>>>>> #to avoid re-registrations when I suspend the master agent's
>>>>> threads in IntelliJ's debugger
>>>>> agentxPingInterval 60000
>>>>> agentXSocket tcp:localhost:1705
>>>>>
>>>>> * I have no issues with connection nor registration...I have
>>>>> attached a SNMP walk of the master in which I grep'd for
>>>>> agentx to observe what was registered by the sub-agent (see
>>>>> attached snmpwalk-grepedForAgentX.log)...I used the following
>>>>> command:
>>>>>
>>>>> /usr/sfw/bin/snmpwalk -v2c -c<community string>-M
>>>>> /etc/sma/snmp/mibs -m ALL <host IP@> 1 | grep agentx >
>>>>> /opt/snmpwalk-grepedForAgentX.log
>>>>>
>>>>> * now.../_the problem_/...It is as follows...I am sending in a
>>>>> simple snmp get request to my master snmp agent (for an OID
>>>>> managed by the net-snmp sub-agent) with the following command:
>>>>>
>>>>> /usr/sfw/bin/snmpget -v2c -c<community string> -r 0 -t 60 <host
>>>>> IP@> 1.3.6.1.2.1.2.1.0 <-- this OID is IF-MIB::ifNumber.0
>>>>>
>>>>> * to which I receive the following response:
>>>>>
>>>>> IF-MIB::ifNumber.0 = No Such Object available on this agent at
>>>>> this OID <--THE PROBLEM
>>>>>
>>>>> * I have attached the net-snmp debug log (see attached
>>>>> snmpd.log) for the above SNMP get request.
>>>>>
>>>>> * if I send in a simple get for an OID managed by the master
>>>>> locally, I have no issue:
>>>>>
>>>>> /usr/sfw/bin/snmpget -r 0 -t 600 -v2c -c<community string><host
>>>>> IP@>sysContact.0
>>>>> SNMPv2-MIB::sysContact.0 = STRING: bob
>>>>>
>>>>> * I don't currently have a log for the master agent (I have
>>>>> issues linking in the log4j with my code base...am working on
>>>>> it) _but_ I have stepped through the code extensively and
>>>>> observed no exceptions or strange code paths for this
>>>>> request...it simply assesses that it must send a GET PDU to
>>>>> the sub-agent and does just that...I have also verified each
>>>>> byte in the encoded PDU...it all looks good.
>>>>>
>>>>> If more info is required please don't hesitate to ask.
>>>>>
>>>>> Thank you,
>>>>> Rob
>>>>>
>>>>> On 6/6/2012 5:39 AM, Frank Fock wrote:
>>>>>> Hi Rob,
>>>>>>
>>>>>> With the NET-SNMP AgentX master and sub-agents several
>>>>>> issues are known. Any of those, are caused by NET-SNMP's
>>>>>> incorrect registration algorithms or simply other bugs
>>>>>> which are not fixed for years now.
>>>>>>
>>>>>> For several issues there exists workarounds. So if you are
>>>>>> using NET-SNMP as a subagent to SNMP4J-AgentX, nearly
>>>>>> everythin should work. You can search for "NET-SNMP"
>>>>>> in the sources of SNMP4J-AgentX to locate the various
>>>>>> workarounds.
>>>>>>
>>>>>> We could probably better help, if you provide more details
>>>>>> on the problem (master log output of the failed request
>>>>>> as well as subagent output, also who is master and who
>>>>>> subagent, etc.)
>>>>>>
>>>>>> Best regards,
>>>>>> Frank
>>>>>>
>>>>>> Am 06.06.2012 02:03, schrieb Rob Morton:
>>>>>>> Hi,
>>>>>>>
>>>>>>> What version(s) of net-snmp are supported by snmp4j's agentxv2.1.0?
>>>>>>>
>>>>>>> I ask because I am getting peculiar 'get' failures on Solaris's
>>>>>>> net-snmpv5.0.9. I get these errors after successful connection,
>>>>>>> registration, pings, etc...I perform an snmpget on IF-MIB::ifNumber.0
>>>>>>> (just an example) and get "IF-MIB::ifNumber.0 = No Such Object available
>>>>>>> on this agent at this OID" This OID region is indeed registered.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Rob
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> SNMP4J mailing list
>>>>>>> SNMP4J at agentpp.org
>>>>>>> http://lists.agentpp.org/mailman/listinfo/snmp4j
>>>>>
>>>>
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>>>> ---
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>>>> Maximilian-Kolbe-Str. 10
>>>> 73257 Koengen, Germany
>>>> https://agentpp.com
>>>> Phone: +49 7024 8688230
>>>> Fax: +49 7024 8688231
>>>
>>
>> --
>> ---
>> AGENT++
>> Maximilian-Kolbe-Str. 10
>> 73257 Koengen, Germany
>> https://agentpp.com
>> Phone: +49 7024 8688230
>> Fax: +49 7024 8688231
>
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