[mrtg] First-time MRTG setup - silly values reported

Martin Reilly mcr at martin-reilly.com
Mon Feb 17 12:16:52 MET 2003

I'm a newbie at the MRTG game, so please excuse me if this is something
obvious. I promise I've read the documentation, and the FAQ, and
searched the archives of this list, and googled for answers already.

I've installed MRTG 2.9.27beta and PERL 5.8 (which other people have
reported success with) on a Windows 2000 SP3 box (with all current MS

Getting it running was painless thanks to the "WIN32 MRTG installation
guide" document.

Starting small, I generated a config file with cfgmaker just for one

So... I have MRTG running - the log files, graphics and HTML pages are
being updated every five minutes - so far so good.

However - the values being reported are just silly. For a serial link at
64K, it's reporting:

Max In: 2048.0 B/s (25.6%) Average In: 1379.0 MB/s (17237132.8%) Current
In: 1832.5 MB/s (22906496.0%) Max Out: 2012.8 MB/s (25159465.6%) Average
Out: 2007.5 MB/s (25093422.0%) Current Out: 16.0 B/s (0.2%) 

The "max in" and "current out" could be right, but the rest are clearly
way out! The values are similar for all interfaces being monitored.

The router is a Cisco 3640 with IOS 12.2.13a.

The relevant part of the config file is:

### Interface 5 >> Descr: 'Serial1/2' | Name: 'Se1/2' | Ip:
'' | Eth: '' ###

Target[]: 5:public at
SetEnv[]: MRTG_INT_IP=""
MaxBytes[]: 8000
Title[]: Traffic Analysis for 5 -- router1.lab.net
PageTop[]: <H1>Traffic Analysis for 5 --
   <TR><TD>System:</TD>     <TD>router1.lab.net in </TD></TR>
   <TR><TD>Maintainer:</TD> <TD>Martin Reilly</TD></TR>
   <TR><TD>Description:</TD><TD>Serial1/2 LEASED LINE 64K to
   <TR><TD>ifType:</TD>     <TD>propPointToPointSerial (22)</TD></TR>
   <TR><TD>ifName:</TD>     <TD>Se1/2</TD></TR>
   <TR><TD>Max Speed:</TD>  <TD>8000.0 Bytes/s</TD></TR>
   <TR><TD>Ip:</TD>         <TD> ()</TD></TR>

I'd appreciate it if anybody could give me some pointers to what I might
have done wrong. (Was it too adventurous to start with a beta for my
first attempt? The install doc said use 2.9.26b or better, and the FTP
server had a comment that 2.9.26 "has issues on windows", so I went with
the newest...)

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