check_ping vs. check_icmp?

[Sean Dilda]

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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