Re: Net-snmp 5.7.3 - Issue to communicate with subAgent and Master Agent

Hello all,
I've performed some actions to fix my problem(s) but I'm not sure the
situation is the one that I though; it's.

I though the Agentx and master agent are connected based on the following
behaviour:

   - I've started the Master agent followed by the Agentx, I got a
   connection message.
   - When stopping the Master Agent, I've seen a message saying that the
   connection between the master agent and the subagent is broken. (message
   AgentX master disconnected us, reconnecting in 15)
   - Is it sufficient to be sure that the Master Agent and Sub-agentx are
   correctly connected ?


I've read that on Google that in the SubagentX configuration file, I need
to declare the MIB which is allocated to the subagent. I'm not sure of the
 keyword to use, I've added in the SubAgentx file: 'view all included'
terminated by the value of my MIB OID. Is it correct ?

If someone has some clues or advices to help me to clearly identify this
problem.

Thanks by advance
Ph. DENIS

Le lun. 3 févr. 2020 à 00:52, Philippe Denis <[email protected]> a écrit :

> *Expéditeur:* Philippe Denis <[email protected]>
>
> *Date:* 3 février 2020 à 00:41:11 UTC+1
> *Destinataire:* Magnus Fromreide <[email protected]>
> *Objet:* *Rép:  Net-snmp 5.7.3 - Issue to communicate with subAgent and
> Master Agent*
>
> Hello,
>
> I’ve succeeded to connect the sub-agent and the master agent by using the
> /var/agents/master in the c code and also in conf. Files.
>
> Both are exchanging request but no value is received from local host or
> through remote.
>
> I got the following error messages ‘´Timeout: No response from localhost’’
> when using a snmpget.
>
> Then I’m wondering if the objects which are part of my daemon are
> correctly registered as I put a syslog in an handler and this one is never
> displays.
>
> How can I know if the sub agent had registred correctly the OIDs?
> Moreover, I read that as a good advice you can generate C code and test it
> on the master agent and after that move it to the sub agent. This code
> should not be impacted.
>
> Then what is the difference between netsnmp_register_long_instance and the
> couple netsnmp_create_handler_registration & netsnmp_register_instance.
> Which one should I used to register objects from my subagent?
>
> Thanks for your help.
> Philippe DENIS
>
> Le 2 févr. 2020 à 23:07, Magnus Fromreide <[email protected]> a écrit :
>
>
> On Sun, Feb 02, 2020 at 02:13:59PM +0100, Philippe Denis wrote:
>
> Hello all,
>
>
> I've a problem to communicate with my subAgent through the Master Agent.
>
> I've used the option -Dnetsnmp_udpbase and the message is correctly
>
> received at master Agent level (of course, the one which send from remote
>
> PC or localhost).
>
>
> The Master Agent is not responding to the request sent by an snmpget
>
> command.
>
>
> The Master Agent is launched with the this command line:
>
>
>
> *snmpd -Dnetsnmp_udpbase -f -Lo -C -c /usr/share/snmp/snmpd.conf
>
> -agentXSocket=tcp:localhost:1705 udp:1161 -VVV*
>
>
> *See attached the log of the command:*
>
>
> Could you please rerun the test with the agent debug flags
>
> -Dagentx -Dtdomain
>
>
> -Dagentx logs the agentx interactions
>
> -Dtdomain logs all opening of sockets
>
>
> *registered debug token netsnmp_udpbase, 1Log handling defined -
>
> disabling stderrTurning on AgentX master support.netsnmp_udpbase: open
>
> local UDP: [0.0.0.0]:1161->[0.0.0.0]:0netsnmp_udpbase: set
>
> IP_PKTINFOnetsnmp_udpbase: binding socket: 7 to UDP:
>
> [0.0.0.0]:0->[0.0.0.0]:1161NET-SNMP version 5.8*
>
>
> Which is based on the one present in
>
> http://net-snmp.sourceforge.net/wiki/index.php/TUT:Writing_a_Subagent
>
>
> The content of the snmpd.conf used is the following one:
>
>
> master agentx
>
> agentxsocket /var/agentx/master
>
> agentxperms 777 777
>
>
> rwuser MyCom_RW
>
> rouser MyCom_RO
>
>
>
> For the subagent, I'm using the following command line:
>
>
> *./mysubagent -f -Lo -x  tcp:localhost:1705*
>
>
>
> *snmpget -v 2c -c MyCom_RW localhost .1.3.6.1.4.1.32699.255.4.1.0Timeout:
>
> No Response from localhost.*
>
>
> I'm quite surprise my mib is known as the snmptranslate -Tp -IR MyTestmib
>
> answered correctly.
>
>
> This means you have told snmptranslate where the mib is located. This is
> good.
>
>
> I've also used net-snmp 5.8 but still have the same result.
>
>
> Thanks by avdance for your help
>
> --
>
> Cordialement
>
> Ph. DENIS
>
>
>
> _______________________________________________
>
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>
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>
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>
>
>

-- 
Cordialement
Ph. DENIS

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