[mrtg] Re: ping probe questions

Wed Jan 2 22:04:12 MET 2002

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

Paul

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

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

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

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

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

Curtis

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

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

My packet loss config is as follows:

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

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

For the first question...

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

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

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

Paul

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

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

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

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

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

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

Thanks in advance,
Curtis

ckline at housing.ucsb.edu 

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