linux commands

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