check_udp_port

Simple shell script that uses nmap utility to check if a remote host is listening on a UDP port and what that service is. For Debian 10 and LibreNMS

Usage

check_udp_port: -H remote_host -p port -s service_name

-H Name or IP of remote host

-p UDP port number to check

-s Name of the service that should be listening on the port

Critical: if service is 'unknown' or state is not open

Warning: if service name expected does not match service name listening on the port

OK: if the port is open and service name expected matches service name listening.

Based on

https://exchange.nagios.org/directory/Plugins/Network-Protocols/*-TCP-and-UDP-(Generic)/check_udp_port/details