- source: 
192.168.1.0/24 - destination: 
172.16.1.0/24 - policy: 
SNAT 
iptables -A FORWARD -s 192.168.1.0/24 -d 172.16.1.1/24 -j ACCEPT
iptables -A FORWARD[......]
					192.168.1.0/24172.16.1.0/24SNATiptables -A FORWARD -s 192.168.1.0/24 -d 172.16.1.1/24 -j ACCEPT
iptables -A FORWARD[......]