noteboot (10.1.1.2)-> |eth2 (10.1.1.1) – eth0 (172.20.200.33)| -> gw (172.20.200.1)

Linux:
*) enable forwarding echo '1' > /proc/sys/net/ipv4/ip_forward
*) turn NAT on iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to 172.20.200.33