Re: SNMP request size

>>>>> On Wed, 16 Mar 2011 18:17:02 +0800, [email protected] said:

r> Is it possible to check the SNMP GET request packet size and split the
r> request to an acceptable size before it gets sent?

r> I'm currently sending the request using VarList but the request dies
r> when the packet length exceeds the transport maximum.

r> Any inputs to get around this limitation is highly appreciated.

It's something that you're only going to be able to do on your side.
It's sort of impossible to do generically.  You can try and estimate the
number of requests you can put in a GET packet and that should be
somewhat estimatable.

However, trying to determine the size of the RESPONSE that comes back
will be significantly trickier.  Consider the sysLocation.0 scaler, for
example, which someone could configure a device to report

  "nowhere"

vs

  "We're located on the 5th floor of the computer science building at 1600
  Alberta street in northern Alberta, which is obviously in Canada, which
  is hopefully obviously in north America".

Both are unfortunately legal answers that will greatly affect the size of
the returned packet.  You won't know it's size until you query it.
-- 
Wes Hardaker
Cobham Analytic Solutions

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