host check through 2 isps simultaneously

[Atul Gosain]

Hi

I have the network of my company thats connected through two isp's. I m 
monitoring an online server which has three  public ip addresses. Now, 
till presently, i had 2 services of ping to check that (check_ping_isp1 
& check_ping_isp2) and routing was defined for them ie. check_ping_isp1 
uses one ip address which uses isp1 to check that host and other service 
uses isp2 to check that host. But the check command for the host can 
only monitor it through one isp only at a time.
Because of this the host is shown down if that isp has a problem 
(through which host check is being done).
Can this be done, that the host is declared as down only when both ping 
services are down or host can be checked through both interfaces and 
declared as down only when both isps are down.

Thanks
Atul.

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