check_icmp/check_ping trigger values

[Bergström Sebastian]

Seems like I've missunderstood something very vital. The difference between service checks and host checks. I honestly don't get it.
So far I haven't separated the two but I realise that I should but I'm still not sure how or why.

When should I use check_host and when should I use check_icmp?

If someone could explain this to me in a simple way I will be most grateful.


//Sebastian

> -----Original Message-----
> From: Andreas Ericsson [mailto:ae at op5.se] 
> Sent: den 17 februari 2005 18:18
> To: nagios-users at lists.sourceforge.net
> Subject: Re: [Nagios-users] check_icmp/check_ping trigger values
> 
> 
> Bergström Sebastian wrote:
> > We are using Nagios 1.2 and are evaluating check_icmp as a 
> check_ping 
> > replacement. Nagios is currently monitoring 21 branchoffices with 
> > Cisco switches and routers using 2mBit connections to each site.
> > 
> > The reason for replacing check_ping is that it produces critical 
> > errors sporadicly. It is pertinent to mention that the 
> critical errors 
> > only occurs during the first checks and therefore does not send 
> > notifications. My mission is to drasticly lower the amount 
> of errors 
> > occuring to an absolute minimum.
> > 
> > What are the most sensible trigger values to use with check_icmp or 
> > check_ping?
> 
> Short answer (read archives for longer one); For service 
> checks, these values should work in most networks with 
> normal-to-high load.
> check_icmp -H $HOSTADDRESS$ -w 200.0,40% -c 500.0,60% -i 
> 200ms max_check_attempts 3
> 
> For host checks;
> # ln -s check_icmp check_host
> check_host -H $HOSTADDRESS$ -i 0.5s -p 10 -t 20 max_check_attempts 3
> 
> check_icmp returns immediately upon any received packet when 
> called as check_host, so it's safe to use a higher packet 
> count and timeout and lower the max_check_attempts 
> accordingly (it won't let nagios sit and wait as check_ping does).
> 
> Remember that check_icmp must be setuid root to work properly 
> on nearly all linux boxen.
> 
> > The original Nagios configuration (the same I am using)
> > are: check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 
> 5000.0,100% -p 1 -t 
> > 20
> > 
> > My definition of sensible in this case is using a value that is 
> > producing as few errors as possible, when there are no real 
> problems.
> > Not sure if this is a attainable goal or not since I know that some 
> > equipment drops ICMP packets if they are to busy.
> > 
> > Any views or comments are appreciated.
> > 
> > 
> > Best regards, Sebastian Bergstroem
> > 
> > ---------------------------------------------- Sebastian Bergstroem 
> > Technical coordinator Kunskapsskolan i Sverige AB 
> > sebastian.bergstroem at kunskapsskolan.se
> > -----------------------------------------------
> > 
> > 
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> 
> -- 
> Andreas Ericsson                   andreas.ericsson at op5.se
> OP5 AB                             www.op5.se
> Lead Developer
> 
> 
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