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Strongswan
An IPv6 ESP connection between the hosts <b>moon</b> and <b>sun</b> is successfully set up. The authentication is based on X.509 certificates. Upon the successful establishment of the IPsec tunnel, automatically inserted ip6tables-based firewall rules let pass the tunneled traffic. In order to test both the host-to-host tunnel and the firewall rules, <b>moon</b> sends an IPv6 ICMP request to <b>sun</b> using the ping6 command.