(local and remote) port forward with iptables
packets sent to 5680 will be forwarded to 80
enable port FW for external communication
iptables -A PREROUTING -t nat -p tcp —dport 5680 -j REDIRECT —to-port 80
enable port FW for internal communication
iptables -t nat -A OUTPUT -p tcp —src 0/0 —dst 127.0.0.1 —dport 5680 -j REDIRECT —to-ports 80
