Check_MK: netstat

Established TCP Connections or TCP/UDP Listeners

Distribution:	official part of Check_MK
License:	GPL
Supported Agents:	Linux, AIX

This check evaluates the output of the netstat command on Linux and AIX and checks if there are established connections or listeners matching a given criteria. 

The check returns OK state if the specified connection/listener is present, and CRIT if not. 

This check needs the agent plugin netstat_an.bat to be installed. 

REF: https://mathias-kettner.com/checkmk_check_netstat.html