check_ping vs. check_icmp?
Sean Dilda
agrajag at dragaera.net
Fri Oct 14 15:13:35 CEST 2005
Andreas Ericsson wrote:
>
> 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 sounds useful. However, how does it do that without getting a lot
of false positives? If the network is just a little loaded, it sounds
like it'll report a host as down when its not.
For what its worth, its not too difficult to get check_ping to only take
1 second to timeout. However, that's still longer than 1 to 10
milliseconds.
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