[mrtg] mrtg, rddtool and ping probe

Ken Boone kenboonejr at yahoo.com
Wed Oct 29 13:55:27 MET 2003

I am relatively new to MRTG and RDDtool etc.  I have
it up and running on a few devices and have figured
out how to do quite a bit with MRTG.  I wanted to be
able to track ping times with the PingProbe module.  I
installed that and it is working and I am getting
graphs, however, in the ping time graphs the data
appears to be wrong.  Just trying to plot min, max
ping times.  I am running this on a win2k box.  I am
pinging a router on the same network.  I have reviewed
the mrtg-ping-probe script to see what it does.  From
what I gather it issues 10 pings to the host then
grabs the average min and max return times.  It then
returns these numbers back to the target statement in
the MRTG cfg file for the router.  What is showing on
the graphs are ping times that are up around 80ms
consistently with drops down to around 40ms as the max
ping time.  The problem is that the ping times are
actually averaging 1 or 2ms with a max of 10ms.  I am
not sure why these numbers are so far off and I can't
figure it out.  The win2k server is on the same test
LAN as the router I am pinging.  I even went through
the mrtg-ping-probe and edited the script to display
the values to me etc.. as the program is running.  It
appears to be returning the proper values
consistently.  Does anyone have any ideas on this.  It
would be greatly appreciated.
kenboonejr at yahoo.com 


Ken Boone, Jr. 
Network Consultant, CCIE #4649 
Boone Networking Services 
Phone:   864-350-7513 

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