[mrtg] Re: ping-probe returns 0

[Peter W. Osel]

> *** Tim Reimers <tim.reimers at asheville.k12.nc.us>
> *** [2004-05-11 12:05:07]:
> I'm trying to get ping-probe working on our LAN-
> It's working fine for hosts off the local LAN (my webserver at home)
> It's not working here-
> when I run the script, it returns '0 0' as values...
> 
> And, of course, there are no graphs--
> 
> I expect that the reason this is happening is because the ping time is
> less than 1 MS on our Gigabit core network-
> 
> But, it _does_ still return values:
> PING 10.10.1.109 (10.10.1.109) from 10.10.1.182 : 56(84) bytes of data.
> 64 bytes from 10.10.1.109: icmp_seq=1 ttl=128 time=0.629 ms
> 64 bytes from 10.10.1.109: icmp_seq=2 ttl=128 time=0.241 ms
> 64 bytes from 10.10.1.109: icmp_seq=3 ttl=128 time=0.440 ms
> 64 bytes from 10.10.1.109: icmp_seq=4 ttl=128 time=0.322 ms
> 64 bytes from 10.10.1.109: icmp_seq=5 ttl=128 time=0.281 ms
> 64 bytes from 10.10.1.109: icmp_seq=6 ttl=128 time=0.336 ms

Hello Tim,


there are two reasons why this is happening,
mrtg wants integers and no fractions ..., 
and I wrote mrtg-ping-probe to monitor WAN links ;-)

possible solutions include:

* use smokeping -- very cool, sexy tool from Tobias
	http://people.ee.ethz.ch/~oetiker/webtools/smokeping/

* i find the time to add a "multiplier", where I multiply the
return values by e.g. 1000 to return us instead of ms.


or try this quick hack in the script (assuming you run mrtg-ping-probe
on Unix and not Windows):

***************
*** 268,274 ****

        # try to find round trip times
        if ($ping_output =~ m@(?:round-trip|rtt)(?:\s+\(ms\))?\s+min/avg/max(?:/(?:m|std)-?dev)?\s+=\s+(\d+(?:\.\d+)?)/(\d+(?:\.\d+)?)/(\d+(?:\.\d+)?)@m) {
!               $pt{min} = $1; $pt{avg} = $2; $pt{max} = $3;
                }
        elsif ($ping_output =~ m@^\s+\w+\s+=\s+(\d+(?:\.\d+)?)ms,\s+\w+\s+=\s+(\d+(?:\.\d+)?)ms,\s+\w+\s+=\s+(\d+(?:\.\d+)?)ms\s+$@m) {
                # this should catch most windows locales
--- 268,274 ----

        # try to find round trip times
        if ($ping_output =~ m@(?:round-trip|rtt)(?:\s+\(ms\))?\s+min/avg/max(?:/(?:m|std)-?dev)?\s+=\s+(\d+(?:\.\d+)?)/(\d+(?:\.\d+)?)/(\d+(?:\.\d+)?)@m) {
!               $pt{min} = $1 * 1000; $pt{avg} = $2 * 1000; $pt{max} = $3 * 1000;
                }
        elsif ($ping_output =~ m@^\s+\w+\s+=\s+(\d+(?:\.\d+)?)ms,\s+\w+\s+=\s+(\d+(?:\.\d+)?)ms,\s+\w+\s+=\s+(\d+(?:\.\d+)?)ms\s+$@m) {
                # this should catch most windows locales



looks almost like modem line noise ;-),
basically you just multiply the ping time ($pt) with 1000,
don't forget to adapt the legend for the graphs to note the
numbers are microseconds and not milliseconds.

Hope this helps

	--pwo


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--
Peter W. Osel                   Principal - Development Systems
Infineon Technologies           Email: pwo at Infineon.COM
North America Corp.             Phone: +1.408.501.6321
1730 North First Street         Fax:   +1.408.501.2410
San Jose, CA 95112, USA         WWW:   http://pwo.de/

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