-A POSTROUTING -d 58.64.154.175 -p tcp --dport 31888 -j MASQUERADE
-A PREROUTING -p tcp --dport 31888 -j DNAT --to-destination 58.64.154.175:31888
-A POSTROUTING -d 58.64.154.175 -p tcp --dport 31800 -j MASQUERADE
-A PREROUTING -p tcp --dport 31800 -j DNAT --to-destination 58.64.154.175:31800