Check for port knock services
- /etc/init.d$ ls
- less knockd
Check config file
- etc/default/knowckd
Run tcp packet on required ports
*for i in 571 290 911; do nmap -Pn -p $i –host-timeout 201 –max-retries 0 x.x.x.x; done
*for i in 571 290 911; do nmap -Pn -p $i –host-timeout 201 –max-retries 0 x.x.x.x; done