Test OpenVPN server on it’s standard UDP port
ping myserver.com
nc -vzu myserver.com 1194- telnet is so 2020 so use nc which does UDP too
- -v verbose
- -z test daemon
- -u UDP
Get a list of hosts with port “X” open
nmap -oG temp -Pn --open -p 80 192.168.0.* > /dev/null; grep Ports temp
- -oG temp: output in grepable format to a file
- –open: only show open ports
- -Pn: scan the shit out of the network – no host discovery first to limit scan
- -p 80: this port to scan… can do a range or selection