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Strongswan

The roadwarrior <b>carol</b> sets up a connection to gateway <b>moon</b>
using multiple authentication exchanges (RFC 4739). In a first round 
both <b>carol</b> and <b>moon</b> authenticate themselves by sending 
an IKEv2 <b>RSA signature</b> accompanied by a certificate.
<p>
In a second round <b>carol</b> then uses the <i>Extensible Authentication Protocol</i>
in association with a <i>GSM Subscriber Identity Module</i> (<b>EAP-SIM</b>) to
authenticate herself against the remote RADIUS server <b>alice</b>. 
In this scenario, triplets from the file <b>/etc/ipsec.d/triplets.dat</b>
are used instead of a physical SIM card on the client <b>carol</b>.
The gateway forwards all EAP messages to the RADIUS server <b>alice</b>
which also uses a static triplets file.
<p>
The roadwarrior <b>dave</b> also uses multiple authentication and succeeds
in the first round but sends wrong EAP-SIM triplets in the second round.
As a consequence the radius server <b>alice</b> returns an <b>Access-Reject</b>
message and the gateway <b>moon</b> sends back an <b>EAP_FAILURE</b>.