- The roadwarrior <b>alice</b> sitting behind the NAT router <b>moon</b> sets up a
- tunnel to the subnet hiding behind the NAT router <b>sun</b>. All IKE and ESP traffic
- directed to the router <b>sun</b> is forwarded to the VPN gateway <b>bob</b>
- using destination NAT. UDP encapsulation is used to traverse the NAT routers.
- <b>leftfirewall=yes</b> automatically inserts iptables-based firewall rules that
- let pass the tunneled traffic. In order to test the double NAT-ed IPsec
- tunnel <b>alice</b> pings the inner IP address of the router <b>sun</b>.
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