iptables -v -t nat -A PREROUTING -d 192.168.2.0/24 -j NETMAP --to 10.8.0.0/24 iptables -v -t nat -A PREROUTING -i tap0 -d 10.8.0.0/24 -j NETMAP --to 192.168.2.0/24 iptables -v -t nat -A POSTROUTING -o tap0 -s 192.168.2.0/24 -j NETMAP --to 10.8.0.0/24 iptables -v -t nat -A POSTROUTING -o eth0 -s 10.8.0.0/24 -j NETMAP --to 192.168.2.0/24 echo 1 > /proc/sys/net/ipv4/ip_forward