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The roadwarriors <b>carol</b> and <b>dave</b> set up an IPv4 connection each to
gateway <b>moon</b> using the <b>IKEv1</b> and <b>IKEv2</b> key exchange protocol,
respectively. The authentication is based on <b>X.509 certificates</b>. <b>dave</b>
advertises the support of the IKEv2 fragmentation protocol defined in <b>RFC 7383</b>
which prevents the IP fragmentation of the IKEv2 messages carrying large X.509
certificates whereas <b>carol</b> announces support of non-standardized
IKEv1 fragmentation.
<p/>
Upon the successful establishment of the IPsec tunnels, the updown script
automatically inserts iptables-based firewall rules that let pass the tunneled traffic.
In order to test both tunnel and firewall, both <b>carol</b> and <b>dave</b> ping
the client <b>alice</b> behind the gateway <b>moon</b>.
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