Please check out the following URL for complete and up to date documentation:
http://www.claudiokuenzler.com/nagios-plugins/check_win_net_usage.php

Version History
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20111116 First version released
20120126 Bugfix in port check
20121010 Bugfix in password handling
20121019 Handling Connection Error (thanks Hermit)


Requirements
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1) check_nt plugin
2) NSClient++ installed on Windows host
3) Set variable 'pluginlocation' at the begin of the plugin to your Nagios plugins path (e.g. /usr/local/nagios/libexec)


Definition of the parameters
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-H Hostname of Windows server to check
-p Listening port of NSClient++ on target server (default 12489)
-s Password in case NSClient++ was defined to use a password
-i Name of network interface to use (not ethX, check Windows performance GUI)
-o Choose output of value in KB, MB (default Byte)
--help Help text


Usage Example
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/usr/local/nagios/libexec # ./check_win_net_usage.sh -H mywindows.server.local -p 12489 -i "VMware Accelerated AMD PCNet Adapter" -o KB
Network OK - 14 Bytes Received/sec, 4 Bytes Sent/sec|bytes_in=14608;bytes_out=4196