[SNMP4J] net-snmp and snmp4j agentx

[Frank Fock]

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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