[mrtg] Strange MRTG problem

Simon Westlake simon.westlake at digitalgunfire.com
Wed May 15 04:26:00 CEST 2013


It's been a long time since I used MRTG (I've been writing directly to rrds
for a long time now) but an old employer of mine asked me to troubleshoot a
legacy MRTG setup and I'm having a strange problem with it I cannot

I am graphing a port in two ways. One is in Cacti, one is with MRTG. Both
are using 64bit counters (I have even setup the MRTG configuration to
specifically use the HC OIDs rather than assuming they are being queried by
specifying :::::2)

In Cacti, I get the correct value (approximately 700-800Mbps per second.)
In MRTG, it is never more than 190-200Mbps.

My MRTG configuration looks like this:

Forks: 30
Refresh: 300
Interval: 5
MaxAge: 999999999999999999999999
SnmpOptions: retries => 1, timeout => 1
LogFormat: rrdtool

Options[DAS-c3229-bandwidth]: growright,bits,nolegend,nobanner,nopercent
Directory[DAS-c3229-bandwidth]: DAS-c3229
Target[DAS-c3229-bandwidth]: at
Extension[DAS-c3229-bandwidth]: php
Suppress[DAS-c3229-bandwidth]: y
Title[DAS-c3229-bandwidth]: Bandwidth Utilization
Maxbytes[DAS-c3229-bandwidth]: 200000000000000000
AbsMax[DAS-c3229-bandwidth]: 200000000000000000

I have tried tweaking a lot of things and I can't seem to figure out what's
going on. Any insight would be appreciated as I'm 2+ days into
troubleshooting this thing and it's driving me crazy. Thanks!
- Simon Westlake
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