[mrtg] Re: Counter wrapping?

[Alex van den Bogaerdt]

Janice Yip wrote:

> I have attached a mrtg 'daily' graph.
> 
> I'm not sure what exactly is the problem and would appreciate answers
> for my cisco router.
> 
> It seems like the incoming traffic will drop to 4mb from 8mb almost
> every other hour.

It seems to be every 70 minutes or so.  In 4200 seconds (which is 70*60
seconds or 70 minutes) at a rate of of 1 MBps (which is 8 Mbps) the
amount of data is 4200000000 bytes.  This is very close to 2^32 so yes,
I do think this is caused by counter wraps.

Try to use 64-bit counters if possible (I cannot help you with that)
or migrate to RRDtool (which handles counter wraps differently).

HTH
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