check_ping vs. check_icmp?
Andreas Ericsson
ae at op5.se
Fri Oct 14 09:54:42 CEST 2005
Nate Carlson wrote:
> What's the difference between check_ping and check_icmp?
>
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.
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).
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.
--
Andreas Ericsson andreas.ericsson at op5.se
OP5 AB www.op5.se
Tel: +46 8-230225 Fax: +46 8-230231
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