check_ping vs. check_icmp?

[John P. Rouillard]

In message <56EAA5BC64E6C34F8C9EE6725D4A2DFA01AA1AFF at tudor.com>,
Andrew Laden writes:
>How does using check_icmp compare to using check_fping?

You missed part of the message. Make a symbolic link to
check_icmp called check_host and execute check_host. Now it's very
fast.

>It seems that check_fping will return a down answer much faster. Since host
>checks are most often run when the host is down, that seems to be the
>performance that we are concerned with.

This still applies.

># time ./check_fping -H em1.dra.tudor.com
>FPING CRITICAL - em1.dra.tudor.com (loss=100% )|loss=100%;;;0;100
>    0.52s real     0.00s user     0.01s system
># time ./check_icmp  -H em1.dra.tudor.com
>CRITICAL - em1.dra.tudor.com: rta nan, lost
>100%|rta=0.000ms;200.000;500.000;0; pl=100%;40;80;; 
>    2.96s real     0.00s user     0.00s system

Sorry, DNS can't resolve em1.dra.tudor.com or I'd show you how much
faster it is in host mode 8-).

>-----Original Message-----
>From: Nate Carlson [mailto:nagios at natecarlson.com] 
>To: Andreas Ericsson
>Subject: Re: [Nagios-users] check_ping vs. check_icmp?
>
>On Fri, 14 Oct 2005, Andreas Ericsson wrote:
>> check_ping executes the external command ping, while check_icmp does 
>> its own fiddling with the ICMP protocol. As a result, check_icmp is 
>> faster, smarter and requires less resources to run.
>>
>> 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.

				-- rouilj
John Rouillard
===========================================================================
My employers don't acknowledge my existence much less my opinions.


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