A simple Java application that performs port knocking by sending TCP and UDP packets to specified ports on a target host with a configurable delay between each knock.
Usage : java -jar java-port-knock.jar (delay=<delay_ms>) (host=<host_str>) [u|t]=<port_int> ...
Example: java -jar java-port-knock.jar delay=250 host=127.0.0.1 t=123 u=345 t=567