Open Port Knock Guarded SSH Port with Netcat

openport-knock-ssh-necat.md

#tips:
#sometimes, use udp and send by parallel is the only way, if you behind a proxy

#----------------------nc way-----------------------------
## input part
SSH_HOST=your_host_ip 

# --way 1-- direct 
for PORT in $PORT1 $PORT2 $PORT3; do nc -vz $SSH_HOST $PORT; done; ssh $SSH_USER@SSH_HOST

# --way 2-- give it some delay
for PORT in $PORT1 $PORT2 $PORT3; do nc -vz $SSH_HOST $PORT; sleep 0.1;  done; ssh $SSH_USER@SSH_HOST

# --way 3-- do as parallel as possible, for some env
for PORT in $PORT1 $PORT2 $PORT3; do bash -c "nc -vz $SSH_HOST $PORT &";  done; ssh $SSH_USER@SSH_HOST
#----------------------nmap way todo-----------------------------
#----------------------knock way todo-----------------------------