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The roadwarriors <b>carol</b> and <b>dave</b> set up an IPv6 tunnel connection each
to gateway <b>moon</b>. The authentication is based on distinct <b>pre-shared keys</b>
and IPv6 addresses. Upon the successful establishment of the IPsec tunnels,
automatically inserted ip6tables-based firewall rules let pass the tunneled traffic.
In order to test both tunnel and firewall, both <b>carol</b> and <b>dave</b> send
an IPv6 ICMP request to client <b>alice</b> behind the gateway <b>moon</b> using
the ping6 command.