Check it on Gist: https://gist.github.com/richardevs/355d24b25f6c19b698b7134504843dc6
# run all these on the bastion vm # iptables can not directly route traffic to public ip ( in my test ) # so I insert a socat here to help get the job done iptables -t nat -F # flush all the current NAT rule ( be careful ) iptables -t nat -A PREROUTING -s 1.1.1.1 -p tcp --dport 443 -j DNAT --to-destination :4433 # all traffic to port 443 from 1.1.1.1 get routed to port 4433 iptables -t nat -A POSTROUTING -j MASQUERADE # let iptables do the NAT work iptables -t nat -nL # double check if iptables are correctly showing the rules nohup socat TCP4-LISTEN:4433,reuseaddr,fork TCP4:2.2.2.2:443 & # use socat to forward traffic to final destination, in the demo here, 2.2.2.2:443
