Nagios passive checks

I'm looking for a solution to monitor a few servers in a quite unique configuration, using Nagios:

There are 5 hosts that need to be monitored.
All of the hosts can communicate between themselves, but only one of them (let's call it the proxy host)
is accessible by Nagios.

Basically what I need is a way to monitor these hosts by using the "proxy host" (the one that is accessible by Nagios).

I've read about passive checks, but I didn't find a way to implement it for this scenario.

Any help will be appreciated.

Thanks!
Marius KaizermanITAsked:
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arnoldCommented:
you need to install a nagios instance on the proxy server that will monitor them and report back to the main one.
For clarity: Presumably opening firewall routes/paths to allow main nagios to query/access these systems is out of the question.

main instance  <=>  nagios in restricted area <=> restricted are servers
Pasive checks <=> active checker

depending on the types of checks you need, configuring the proxy as a reverse proxy for ports that are then mapped to the restricted host/port....
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Marius KaizermanITAuthor Commented:
So a full Nagios installation is needed in the restricted area ?
Nothing else available, like a "Nagios proxy" ?

Thanks.
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arnoldCommented:
The secondary setup instance is the only way. The proxy setup would require you to open paths that are restricted by the existing firewall effectively exposing the internal/restricted system to a possible mistake.
Since you are planing on using the existing proxy (presumably reverse proxy) that is currently being accessed .........

The two instances let you test external (from the main) while testing internal portions using the second internal instance.
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arnoldCommented:
It also depends on what it is you are monitoring.

If the restricted systems can use traps to send to the main nagios server, those trap can be used as passive checks. ......
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