- 1 Start a particular openvpn client
- 2 test server networking using UDP
- 3 find opening port
- 4 find which process opening a particular port
1 Start a particular openvpn client
$ sudo systemctl start openvpn@client1
$ sudo systemctl status openvpn@client1
2 test server networking using UDP
$ nc -v -z -u server port # test server:port using UDP
3 find opening port
$ netstat -an
4 find which process opening a particular port
$ lsof -i :5000