[snmp] bulk request

[Birgit Arkesteijn]

Dear Ferry,

I think your right, this should work.

I just read the section in the rfc again, see
http://www.ietf.org/rfc/rfc3416.txt
4.2.3.  The GetBulkRequest-PDU


Regarding the repetitions is says:
    (2)   If there is no (i)-th lexicographic successor, then the
          corresponding variable binding produced in the Response-PDU has
          its value field set to "endOfMibView", and its name field set
          to either the last lexicographic successor, or if there are no
          lexicographic successors, to the (N + r)-th variable binding's
          name in the request.

    (2)   The response may also be generated with a lesser number of
          variable bindings if for some value of iteration i, such that i
          is greater than zero and less than or equal to M, that all of
          the generated variable bindings have the value field set to
          "endOfMibView".  In this case, the variable bindings may be
          truncated after the (N + (i * R))-th variable binding.

So, yes, it should either return a few "endOfMibView" or it should only 
return the entries in the table that are available (but are less than 
MaxRepetitions).

Either way, the agent is sending you an invalid response. There's 
nothing the stack can do about it.

Pure speculation on my part, but what I thinking is happening is that 
the agent calculates the length based on the value of MaxRepetitions, 
but the actual varbind list is shorter.

Cheers, Birgit


On 10/04/08 12:42, Ferry Huberts wrote:
> Hi!
> 
> I'm trying to send out a PDU for a bulk request. When there are less entries in the table I'm
> trying to retrieve than the MaxRepetitions it doesn't work and I get
> 
> 
> uk.co.westhawk.snmp.stack.DecodingException: Incorrect packet. No of bytes received less than
> packet length.
> 	at uk.co.westhawk.snmp.stack.Pdu.fillin(Pdu.java:914)
> 	at uk.co.westhawk.snmp.stack.SnmpContextv2c.processIncomingResponse(SnmpContextv2c.java:150) at
> uk.co.westhawk.snmp.stack.AbstractSnmpContext.run(AbstractSnmpContext.java:532) at
> java.lang.Thread.run(Thread.java:619)
> 
> I would have thought that this would work, that it would just return the number of entries in the
> table. Am I misunderstanding functionality or is it a bug?
> 
> I'm using v6.0
> --
> Ferry Huberts


-- 
-- Birgit Arkesteijn, birgit at westhawk.co.uk,
-- Westhawk Ltd, Albion Wharf, 19 Albion Street, Manchester M1 5LN, UK
-- Company no: 1769350
-- Registered Office:
-- 15 London Road, Stockton Heath, Warrington WA4 6SJ. UK.
-- tel.: +44 (0)161 237 0660
-- <URL: http://www.westhawk.co.uk>