Lepsi NAT 1:1 nezli SNAT+DNAT:

  iptables -t nat -A PREROUTING -d 172.20.68.27 -j NETMAP --to 10.1.0.7 
  iptables -t nat -A POSTROUTING -s 10.1.0.7 -j NETMAP --to 172.20.68.27