The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each to gateway <b>moon</b>.
At the outset the gateway authenticates itself to the client by sending
an IKEv2 <b>digital signature</b> accompanied by an X.509 certificate.
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Next <b>carol</b> and <b>dave</b> et up an <b>EAP-TTLS</b> tunnel each via
gateway <b>moon</b> to the RADIUS server <b>alice</b> authenticated by an X.509
AAA certificate. The strong EAP-TTLS tunnel protects the ensuing weak client
authentication based on <b>EAP-MD5</b>. <b>carol</b> presents the correct MD5 password
and succeeds whereas <b>dave</b> chooses the wrong password and fails.