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Strongswan

The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each to gateway <b>moon</b>.
The strong mutual authentication is based on <b>EAP-TTLS</b> only (without a separate IKEv2
authentication) with the gateway being authenticated by a server certificate during the
EAP-TLS tunnel setup (phase1 of EAP-TTLS). This tunnel protects the ensuing weak client
authentication based on <b>EAP-MD5</b> (phase2 of EAP-TTLS).
<p/>
With the default setting <b>charon.plugins.eap-ttls.phase2_piggyback = no</b> the server
<b>moon</b> passively waits for the clients to initiate phase2 of the EAP-TTLS protocol by
sending a tunneled orphan EAP Identity response upon the reception of the server's TLS
Finished message. Client <b>carol</b> presents the correct MD5 password and succeeds
whereas client <b>dave</b> chooses the wrong password and fails.