- On computer A route traffic going to 172.17.0.0/16 over 192.168.1.73
ip route add 172.17.0.0/16 via 192.168.1.73
- On computer B
iptables -I FORWARD -s 192.168.1.56 -j ACCEPT
ip route add 172.17.0.0/16 via 192.168.1.73
iptables -I FORWARD -s 192.168.1.56 -j ACCEPT