[mrtg] big peaks on counter-reset

[Oliver Lehmann]

Hi, 

I'm using mrtg to create graphs for per-IP traffic logged by my firewall.
I notice a 771MB/min peak every night around 0 'o clock where I reset the
traffic counter in my firewall to 0. 

I've logged the numbers mrtg got which where producing the peaks and found
no such high values. 

Thu May 11 22:59:25 CEST 2006: 50777100
Thu May 11 23:04:25 CEST 2006: 50834227
Thu May 11 23:09:25 CEST 2006: 51016350
Thu May 11 23:14:25 CEST 2006: 51073275
Thu May 11 23:19:25 CEST 2006: 51131756
Thu May 11 23:24:25 CEST 2006: 51255869
Thu May 11 23:29:25 CEST 2006: 51920994
Thu May 11 23:34:25 CEST 2006: 51984903
Thu May 11 23:39:25 CEST 2006: 52052817
Thu May 11 23:44:25 CEST 2006: 52166959
Thu May 11 23:49:25 CEST 2006: 52284969
Thu May 11 23:54:25 CEST 2006: 52363058
Thu May 11 23:59:25 CEST 2006: 52481936
Fri May 12 00:04:25 CEST 2006: 95320
Fri May 12 00:09:25 CEST 2006: 176897
Fri May 12 00:14:26 CEST 2006: 270364
Fri May 12 00:19:25 CEST 2006: 317801
Fri May 12 00:24:25 CEST 2006: 419102
Fri May 12 00:29:25 CEST 2006: 505616
Fri May 12 00:34:25 CEST 2006: 665656
Fri May 12 00:39:25 CEST 2006: 709925
Fri May 12 00:44:25 CEST 2006: 775258
Fri May 12 00:49:25 CEST 2006: 856786
Fri May 12 00:54:25 CEST 2006: 955909
Fri May 12 00:59:26 CEST 2006: 1011545
Fri May 12 01:04:25 CEST 2006: 1127420
Fri May 12 01:09:25 CEST 2006: 13542498 

I thought MRTG can handle things like counters starting counting again
with 0 since it would happen some time anyway? 

The corresponding mrtg.cfg entry is: 


Title[ipfw0]: Traffic for rl0 (ipfw) in and out
MaxBytes[ipfw0]: 1000000000
PageTop[ipfw0]: <h1>Traffic for rl0 (ipfw) in and out</h1>
Target[ipfw0]: `/root/get_ipfw_count.sh 00100 00101`
LegendI[ipfw0]: &nbsp;in:
LegendO[ipfw0]: &nbsp;out:
WithPeak[ipfw0]: ymwd
Options[ipfw0]: perminute 


global options are: 

Options[_]: growright
RunAsDaemon: Yes
AddHead[_]: <style type="text/css">body {font-family:Verdana, Arial,
Helvetica, sans-serif; background-color:#000000; color:#FFFFFF;font-size:
12px;align:center;text-align:center;margin:auto;} table{margin:auto;}
</style> 

XScale[_]: 1.5
YScale[_]: 2.0
XSize[_]: 600
YSize[_]: 150 

Any ideas how I get that fixed?

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