If you have troubles running a 64 bit powershell with NCPA, then look at this.

The awesome NCPA agent - one agent to rule them all

Great news:

There will be a new release of the best Nagios monitoring agent: NCPA in the near future with lots of bugfixes and new features.

NCPA is working on many operating systems (Windows, Linux, MAC) and the configuration is very easy.

You can get the actual stable (1.8.1) here.

Forget NSClient++ or forks of this horribly agent, where configuration is very time consuming!!!

#!/bin/bash
###########################################################################################
#
# Author:		ccztux
#			http://www.linuxinside.at
#			2011-12-28
#
# Last Modification:	ccztux
#			http://www.linuxinside.at
#			2013-02-11
#
# Description:		Find out public IP.
#
# Changelog:		1.0 Initial revision
#			1.1 Bugfix: chkRC
#			1.2 Verbose output added
#			1.3 whatismyip.org-address changed
#			1.4 changed whatismyip.org to ifconfig.me
#			1.5 script reworked, chkInetConn added
#
# License GPLv3+:	GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
#