[mrtg] Re: Cumulative graphing issue using "gauge" option - data wrap s after hitting 2^32 Bytes ...

Alex van den Bogaerdt alex at ergens.op.het.net
Tue Oct 7 09:38:02 MEST 2003

On Tue, Oct 07, 2003 at 02:36:39PM +1000, dhazell at aap.com.au wrote:
> Dear all
> I am trying to graph the cumulative usage im megabytes of the ports from our
> routers to our isps. So far my graphs are quite good except that the OIDs in
> question that I am monitoring seem to wrap (go back to zero) after they get
> to around 4000000000 bytes (2 ^ 32 bytes).
> I was thinking that I could write a script to tweak the data that is stored
> in the .log file to somehow recognise that the counter has wrapped and
> simply process the .log data so that the data continues incrementing instead
> of going back to zero.

Alternatively: write your own script that queries the device,
handles any overflow (counterwrap), and returns the difference
to MRTG.  MRTG needs to call this script using the external
program; it needs to process the numbers as ABSOLUTE.

Make sure your program knows when MRTG failed to update its log,
and make sure your program knows when a counter was reset rather
than wrapped.


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