Re: Problem using net-snmp as subagent (Error in packet)

Hi Dave,

I have not forgotten to put together the AgentX
issues that I have found while testing NET-SNMP
interoperability. I think I can provide that
report next weekend.

Meanwhile I came across another issue related
to NET-SNMP:

SNMP4J(-Agent) supports engine ID discovery.
A SNMP4J user reported, that he used a 5.3.1
NET-SNMP tool to send an inform request to
a SNMP4J based manager application.

The NET-SNMP tool sends a GET PDU
to discover SNMP4J's engine ID.
SNMP4J sends back a REPORT PDU with its
engine ID in the authoritative engine ID
field and the contextEngineID field is empty.
NET-SNMP seems to ignore the authoritative
engine ID and again sends a discover GET PDU.

If the contextEngineID is set to the
authoritative engine ID then NET-SNMP
seems to recognize the engine ID and sends the
INFORM PDU. I am writing "seems to" because
this has been tested with another tool which
sends its REPORT from the same port as it
received the GET PDU whereas SNMP4J is using
a different port (and no contextEngineID).

 From my point of view this is a bug because
RFC 3414 states in §3.2 that specifying the
contextEngineID in a REPORT PDU is optional.

What do you think about this?

Cheers,
Frank

Dave Shield wrote:
> 
> We're currently in the (early) process of releasing 5.2.4,
> so it's an ideal time to fix that particular line.  Fixes for
> the 5.3.x and 5.4.x lines will take a little longer, but
> I can get the patch applied so it's ready to roll out.
> 
> 
>> BTW, I have implemented a few workarounds into
>> SNMP4J-AgentX and AgentX++ to cope with some bugs
>> of the NET-SNMP subagent. Are interested in the
>> details?
> 
> Most Definitely!
> I've been pulling together the outstanding bugs on our
> tracker system, so it would be good to get as much of
> this sorted as possible.   A clear analysis of where things
> have gone wrong is invaluable.
> 
>>         There seem also to be 64bit OS related bugs
>> when encoding an IpAddress on AgentX.
> 
> That wouldn't surprise me either.
> Let us have what you've got, and we'll see what we
> can do.
> 
> Dave
> 


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