Changing behavior of check-host-alive?

[RT]

Using: Nagios 3.2.2.

By default, Nagios considers a host down if it is unreachable by ICMP. From
what I understand, if a host is unreachable, then further notifications for
the host are disabled.

We have a hostgroup that is always reachable by ICMP (the hosts are usually
exhausted of memory and hard-lock) and should only be considered "down" if
SSH isn't available. The desired behavior would be to suppress all other
notifications for the host if SSH is unreachable.

Is this accomplished by altering the 'check_command check-host-alive' within
the host template and creating a new 'check-host-by-ssh' command in the
Command Definitions?

Thank you for your help.
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