ping output error in 1.4a plugins in Fedora Core
Stanley Hopcroft
Stanley.Hopcroft at IPAustralia.Gov.AU
Mon Sep 13 03:02:27 CEST 2004
Dear Sir,
I am writing to thank you for your letter and say,
> Message: 13
> Date: Thu, 09 Sep 2004 16:32:19 +0200
> From: Andreas Ericsson <ae at op5.se>
> To: nagios-users at lists.sourceforge.net
> Subject: Re: [Nagios-users] ping output error in 1.4a plugins in Fedora Core
> 2
.. snip ..
>
> Why don't you just use check_ping from 1.3.1 if that works for you, or
> check_icmp if you want perfdata and a plugin that's friendlier to your
> system load?
>
The _extra_ system load of running check_icmp as a replacement for
check_ping on this FreeBSD 4.9-RLEASE system is non trivial; I would not
consider it 'friendlier to your system load' on this system for any
commonly accepted notion of 'friendlier', despite having experimented
with the check_icmp tuning options.
To sum up, the Pros and Cons of the reachability plugins from my point
of view are
Factor Good Bad
system load check_ping check_icmp (* only tested on
one [1] FreeBSD
system)
elegance check_icmp check_ping
portability/ check_icmp check_ping
maintainability
reliability check_ping check_fping(can't comment on check_icmp;
'reliably' means RTA & PLR
similar to 'ping' command)
That said, I have also found problems with check_fping (would not
reliably detect down hosts: check_fping is a non starter for me), so the
search for a better check_ping continues.
This may be an exceptional result and _check_icmp_ may indeed be more
friendly to system load on other systems.
Check_icmp is a well conceived and potentially superior product. Perhaps
there needs to be added to it, to realise this potential, an autotuning
utility that generates the command line parameters that will
1 minimise system load
2 minimise differences from the ping program output
Yours sincerely.
--
Stanley Hopcroft
Network specialist, IT Infrastructure
IP Australia
Ph: (02) 6283 3189 Fax: (02) 6281 1353
PO Box 200 Woden ACT 2606
http://www.ipaustralia.gov.au
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