1、通过代理访问121.8.210.236的转向访问192.168.191.236
sudo iptables -t nat -A OUTPUT -d 121.8.210.236 -j DNAT --to-destination 192.168.191.236
sudo iptables -t nat -A OUTPUT -d 10.0.0.2 -p tcp --dport 11211 -j DNAT --to-destination 192.168.1.33:11211
2、反过来，访问192.168.191.236的转向访问121.8.210.236
sudo iptables -t nat -A OUTPUT -d 192.168.191.236 -j DNAT --to-destination 121.8.210.236