1: The roadwarriors <b>alice</b> and <b>venus</b> sitting behind the NAT router <b>moon</b> set up
2: tunnels to gateway <b>sun</b>. UDP encapsulation is used to traverse the NAT router.
3: Each roadwarrior shares its own Pre-Shared Key (PSK) with the gateway <b>sun</b>.
4: <p/>
5: Upon the successful establishment of the IPsec tunnels, the updown script automatically
6: inserts iptables-based firewall rules that let pass the tunneled traffic.
7: In order to test the tunnel, the NAT-ed hosts <b>alice</b> and <b>venus</b>
8: ping the client <b>bob</b> behind the gateway <b>sun</b>.
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