An IPsec <b>transport-mode</b> connection between the hosts <b>moon</b> and <b>sun</b>
is successfully set up. The authentication is based on X.509 certificates.
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Upon the successful establishment of the IPsec connection, the updown script automatically
inserts iptables-based firewall rules that let pass the protected traffic.
In order to test the host-to-host tunnel <b>moon</b> pings <b>sun</b>.