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The roadwarrior <b>carol</b> sets up a connection to gateway <b>moon</b>.
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At the outset the gateway authenticates itself to the client by sending
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an IKEv2 <b>RSA signature</b> accompanied by a certificate.
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<b>carol</b> then uses the <i>Extensible Authentication Protocol</i>
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in association with an <i>MD5</i> challenge and response protocol
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(<b>EAP-MD5</b>) to authenticate against the gateway <b>moon</b>.
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The user password is kept in <b>ipsec.secrets</b> on the client <b>carol</b>
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and the gateway forwards all EAP messages to the RADIUS server <b>alice</b>.