How to monitor Nagios itself?

[David Knutson]

I've completed the setup of a Nagios system to monitor a number of our
internal systems, and it seems to be working great.  Now I want to setup
a system at a remote site to monitor the monitor!  All I want this
second system to do is alert me when the first system goes down.  Of
course, I would also monitor the second system from the first. 
Complicating this is the fact of a firewall between the two systems -
for instance, I can't run check_ping because the firewall stops it.  And
I can't use a VPN.  
 
So, can anyone recommend a reliable set of checks to run that will
monitor the monitors and pass through a firewall?
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