[mrtg] Re: ping probe questions

Jake Colman colman at ppllc.com
Wed Jan 2 23:16:26 MET 2002 


Paul,

Would you mind sending me the required config files for setting it up?  I
downloaded the package but the documentation is a bit sparse.

RRDTool is packaged with mrtg, right?

How much overhead is incurred, both on the internet in general and on your
own network, when doing all these pings?  Are you showering a number of pings
every certain number of minutes on order to generate the performance graphs?

...Jake

    PCW> It's a standalone tool.  It requires RRDTool, fping, speedyCGI, a
    PCW> webserver, and Perl.  Tobi says 5.6.1, but I've got it running fine
    PCW> with 5.6.0.

    PCW> Once you get it running, similar to MRTG, you'll wonder how you did
    PCW> any troubleshooting without this tool running, gathering stats all
    PCW> the time.

    PCW> Paul

    >>>> Jake Colman <colman at ppllc.com> 01/02/02 04:53PM >>>


    PCW> Paul,

    PCW> Is smokeping used together with mrtg for graphing?  Or is it a
    PCW> standalone tool?

    PCW> ...Jake

>>>>> "PCW" == Paul C Williamson <pwilliamson at mandtbank.com> writes:

    PCW> If you are up to it, try smokeping.  It is really neat, and quite
    PCW> useful.  ping-probe is good for min/max rtt, but smokeping is great
    PCW> for measuring system load and response indirectly as well as rtt.

    PCW> Paul

    >>>>> "Curtis Kline" <ckline at housing.ucsb.edu> 01/02/02 03:56PM >>>

    PCW> Well, after a reality check from Paul (thanks), I believe I've about
    PCW> got this figured out... I needed a "-p loss/loss" in my target line.
    PCW> Here's my latest config excerpt, that seems to be working:


    PCW> # monitor packet loss
    PCW> Title[10.20.1.136.loss]: Packet Loss Analysis
    PCW> PageTop[10.20.1.136.loss]: <H1>Packet Loss Analysis</H1>
    PCW> MaxBytes[10.20.1.136.loss]: 100 AbsMax[10.20.1.136.loss]: 101
    PCW> Options[10.20.1.136.loss]: gauge, withzeroes
    PCW> Target[10.20.1.136.loss]: `/usr/local/mrtg-2/bin/mrtg-ping-probe -k
    PCW> 50 -p loss/loss 10.20.1.136` YLegend[10.20.1.136.loss]: % Packet
    PCW> Loss ShortLegend[10.20.1.136.loss]: % Legend1[10.20.1.136.loss]: %
    PCW> Packet Loss Legend2[10.20.1.136.loss]: % Packet Loss
    PCW> Legend3[10.20.1.136.loss]: Maximal 5 Minute % Packet Loss
    PCW> Legend4[10.20.1.136.loss]: Maximal 5 Minute % Packet Loss
    PCW> LegendI[10.20.1.136.loss]: &nbsp;% loss: LegendO[10.20.1.136.loss]:
    PCW> &nbsp;% loss:


    PCW> It is now obvious to me that both the green area and the blue line
    PCW> are now graphing the same thing: Packet Loss.

    PCW> I decided to ping 50 times each round, although that does take some
    PCW> time.


    PCW> Curtis




    PCW> -----Original Message----- From: Curtis Kline Sent: Wednesday,
    PCW> January 02, 2002 10:58 AM To: Paul C. Williamson;
    PCW> mrtg at list.ee.ethz.ch Subject: [mrtg] Re: ping probe questions



    PCW> Hrm, from the ping-probe website (http://www.pwo.de) I gather that
    PCW> packet loss was introduced on 2001/01/06 with release 2.0.0.  I have
    PCW> version 2.0.2 dated 2001/01/21.


    PCW> My packet loss config is as follows:

    PCW> # monitor packet loss
    PCW> Title[10.20.2.137.loss]: Packet Loss Analysis
    PCW> PageTop[10.20.2.137.loss]: <H1>Packet Loss Analysis</H1>
    PCW> MaxBytes[10.20.2.137.loss]: 100 AbsMax[10.20.2.137.loss]: 101
    PCW> WithPeak[10.20.2.137.loss]: ymwd Options[10.20.2.137.loss]: gauge
    PCW> Target[10.20.2.137.loss]: `/usr/local/mrtg-2/bin/mrtg-ping-probe
    PCW> 10.20.2.137` Unscaled[10.20.2.137.loss]: dwmy
    PCW> YLegend[10.20.2.137.loss]: % Packet Loss
    PCW> ShortLegend[10.20.2.137.loss]: % Legend1[10.20.2.137.loss]: % Packet
    PCW> Loss Legend2[10.20.2.137.loss]: % Packet Loss
    PCW> Legend3[10.20.2.137.loss]: Maximal 5 Minute % Packet Loss
    PCW> Legend4[10.20.2.137.loss]: Maximal 5 Minute % Packet Loss
    PCW> LegendI[10.20.2.137.loss]: &nbsp;% loss: LegendO[10.20.2.137.loss]:
    PCW> &nbsp;% loss:



    PCW> -----Original Message----- From: Paul C. Williamson
    PCW> [mailto:pwilliamson at mandtbank.com] Sent: Wednesday, January 02, 2002
    PCW> 10:49 AM To: Curtis Kline; mrtg at list.ee.ethz.ch Subject: Re: [mrtg]
    PCW> ping probe questions


    PCW> For the first question...

    PCW> There should have been a config supplied with the script.  If not, I
    PCW> can

    PCW> post mine.  FWIW, the green is MAX RTT and the blue is MIN RTT.

    PCW> For the second question, I didn't know ping-probe did packet loss.
    PCW> The version I have is 2.2, dated 2001/01/07.  Is there a newer
    PCW> version that reports packet loss?

    PCW> Paul

    >>>>> "Curtis Kline" <ckline at housing.ucsb.edu> 01/02/02 01:40PM >>>


    PCW> Please forgive me if these questions have already been answered on
    PCW> this list, I have been unable to find them in the archives.

    PCW> With regard to the current version of ping probe, I have a couple
    PCW> questions:


    PCW> 1.  What is graphed on the blue line vs. the green shaded area?  The
    PCW> values are wildly different, but I can't seem to determine what each
    PCW> represents.

    PCW> 2.  I am trying to graph packet loss between my mrtg host and some
    PCW> cable modems a couple hops away. When I continuously ping one of the
    PCW> modems from the Linux shell on the mrtg host I get 0% packet loss
    PCW> over about a 5 minute period. However, ping probe reports 35% loss
    PCW> average on the green shaded area and 6% loss average on the blue
    PCW> line.  In some cases, my max loss on the green shaded area is
    PCW> 101%.. that seems unlikely.

    PCW> Can anyone provide some clue as to why this might be the case?


    PCW> Thanks in advance, Curtis

    PCW> ckline at housing.ucsb.edu




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    PCW> Jake Colman                     

Principia Partners LLC                  Phone: (201) 946-0300
Harborside Financial Center               Fax: (201) 946-0320
902 Plaza Two                          E-mail: colman at ppllc.com 
Jersey City, NJ 07311                  www.principiapartners.com 

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Jake Colman                     

Principia Partners LLC                  Phone: (201) 946-0300
Harborside Financial Center               Fax: (201) 946-0320
902 Plaza Two                          E-mail: colman at ppllc.com
Jersey City, NJ 07311                  www.principiapartners.com

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