iptables forwarding

1, by proxy access 121.8.210.236 steering visit 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, in turn, visit turned 192.168.191.236 access 121.8.210.236

sudo iptables -t nat -A OUTPUT -d 192.168.191.236 -j DNAT --to-destination 121.8.210.236