[mrtg] Re: Unexpected drop-outs in graphs

Alex van den Bogaerdt alex at ergens.op.het.net
Mon Jun 16 18:30:15 MEST 2003

On Mon, Jun 16, 2003 at 05:06:12PM +0100, Nick Earle wrote:
> I'm having a problem with MRTG which is resulting in drop-outs in my graphs. The drop-out appear to occur after a specific amount of traffic has passed, as the area between each drop-out appears to be the same. Please take a look at the attached graph to see what I mean.

To me it appears this happens after 2^32 octets.

Look attime 12 to 20:
12 to 20: roughly 8 hours at 1200 Kbps:  8*3600*1200*1000/8 = 4320000000
20 to 01: roughly 5 hours at 1800 Kbps:  5*3600*1800*1000/8 = 4050000000
11 to 15:30 : roughly 4.5 hours at 2000 Kbps: 4.5*3500*2000*1000/8 = 3937500000

All these numbers are close to 2^32 which is 4294967296.

This doesn't help much but at least the "specific amount of traffic" can
now be guessed to be 2^32 octets.

Could it be that you are using 64-bit counters that wrap at 2^32 ?

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