iptables forward ip&port

## remote forward ##

iptables -t nat -A PREROUTING -d LocalIP -p tcp --dport PortNumber -j DNAT --to-destination DestinationIP:Port

iptables -t nat -A POSTROUTING -d estinationIP -p tcp --dport PortNumber -j SNAT --to-source LocalIP

## local forward ##

 iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8080
 
 iptables -t nat -A OUTPUT -p tcp -d 127.0.0.1 --dport 80 -j DNAT --to 127.0.0.1:8080
 
 iptables -t nat -A OUTPUT -p tcp -d 192.168.1.17 --dport 80 -j DNAT --to 127.0.0.1:8080  # 192.168.1.17 is localIP