knockd_auto_wrapper

A shell script wrapper which automates port knocking via knockd .

Pls note to enable ufw firewall to block all packets. We then use knockd to add rules to iptables.

In Server: chmod +x knockd.sh ./knockd.sh

Inputs

Just enter the values as asked.

Sequence: 7000,8000,9000, Port: 22, cmd_timeout: 20, interface: ens1

In client/ from where you are trying to connect, install knockd too, ( I used brew isntall knock for mac ) Before port knocking nmap -Pn -p 22 ip

PORT STATE SERVICE 22/tcp filtered ssh

PORT	STATE	SERVICE
22/tcp	filtered	ssh

knock -v ip 7000 8000 9000

After port knocking enabled: nmap -Pn -p 22 ip

PORT	STATE	SERVICE
22/tcp	open	ssh

Note: This happens after cmd_timeout is over