SNMP++ V3 - Data size problem

[Frank Fock]

Hi Shrikanth,

The debugging output shows the sender of request
(the management app) does not allow the response
to be longer then 2028 bytes. AGENT++ has encoded
a response with 2068 bytes which is > 2028. That's
why the response could not be send. The latest
version of AGENT++ should be able to precisly forecast
the length of a PDU and return a smaller one if the
request is a GETBULK.

If you are using the latest version, then this might
be a bug in AGENT++. As a workaround you could increase
the maxMessageSize of the sending application.

Best regards,
Frank Fock

Shrikanth D wrote:
> Hi,
>  
> I am developing a snmp V3 agent.
> I have a Mib table with more than 20 columns in it - many of them strings.
>  
> When a snmp manager requests just 1 row from this table using getBulk 
> everything works fine.
> But when the manager requests more rows in its getBulk request - say 10 
> rows, then I see the following error message on the console and no 
> response is sent back to the manager.
>  
> ////////////////////////////////////////////////////////////////////////
> usmBuildWholeMsg error: msgDataLength = 2068
> maxLength = 2028, encoded = 85
> usm: could not generate wholeMsg
> v3MP finished NOT OK: errorcode 1401.
> ////////////////////////////////////////////////////////////////////////
>  
> As I understand, irrespective of the number of rows the manager 
> requests, the agent must fill the maximum possible complete rows and 
> return. But this error is perplexing.
> Should the manager then only request one row by row?
>  
> I have another related query, presently the size of a snmp pdu is being 
> limited to around 1k. What happens, if a single row of a table exceeds 
> this limit? This is quite possible in my case!
>  
> Thanks and regards,
> Shrikanth
>  
> 
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