- The roadwarrior <b>alice</b> sitting behind the NAT router <b>moon</b> sets up a tunnel to
- the peer <b>bob</b> hiding behind the NAT router <b>sun</b>. 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 <b>bob</b>.
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