To send continuous packets to a port on a server
useful for when your are tracing packets to troubleshoot a VPN or connection problem.
The following will keep retrying
while true; do nc <ip address of server> <port>;done
while true; do nc 192.168.0.1 8080;done
or if you prefer telnet over netcat
while true; do telnet 192.168.0.1 8080;done
can also be used to keep retrying your ssh connection until it connects.
while true; do ssh firstname.lastname@example.org ;done