check_ping vs. check_icmp? Unexpected output.

[Andreas Ericsson]

John P. Rouillard wrote:
> In message <434F6442.8020004 at op5.se>,
> Andreas Ericsson writes:
> 
> 
>>Nate Carlson wrote:
>>
>>>What's the difference between check_ping and check_icmp?
>>>
>>
>>check_icmp can also be used in check_host mode (create a symlink 
>>check_host -> check_icmp and execute check_host) which runs extremely 
>>quickly to determine if a host is up whenever a service check fails. 
>>Ordinary check_ping would take 5 seconds to determine that the host is 
>>up in an ordinary setup, while check_host usually does the same trick in 
>>just about the same amount of time as it takes for a packet to make a 
>>round trip to the destination target (usually between 1 and 10 
>>milliseconds on a local network).
> 
> 
> That is great info. "check_icmp -h" doesn't mention the check_host
> functioanlity at all.
> 

I know. I'm one of those lazy people who think users should read the 
code if they want documentation. I'll make a mention of it though.

> 
>>Considering the fact that service checks aren't executed while host 
>>checks are running, the check_host mode of check_icmp is a fairly major 
>>improvement in terms of overall Nagios performance.
> 
> 
> 
> I have the check_host link in place and with the 1.4.2 release of the
> plugins, with cvs id:
> 
>    * $Id: check_icmp.c,v 1.5 2005/02/01 07:33:13 stanleyhopcroft Exp $
> 

This isn't anywhere near the latest version and I believe I've added 
quite a few patches to it since then. For the latest version you'll need 
the plugin-pack from http://oss.op5.se/nagios.

Quite a lot of bugs has been fixed since february.

[ ... cut ... ]

> 
> Also the nagios-plugins Makefile fails to create the links to
> check_host or check_rta_multi.
> 

True. The check_rta_multi isn't very tested or documented. The 
check_host link would most likely be nice to create though. I'll add it 
to the OP5 version of the plugins as soon as I get around to it.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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