If you ever want to try port forwarding with iptables, here is a quick example of forwarding a public port (45000) – public network to a private port (22) – ssh – private network:
$ iptables -t nat -A PREROUTING -p tcp --dport 45000 -j DNAT --to-destination 192.168.1.200:22 $ iptables -t nat -A POSTROUTING -j MASQUERADE
If this is not working, check if your system has enabled ip forwarding. If not, execute this in your terminal:
$ sysctl net.ipv4.ip_forward=1
* The above command might not work if you are on a VPS.