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1.1 misho 1: The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each to gateway <b>moon</b> 2: using EAP-TTLS authentication only with the gateway presenting a server certificate and 3: the clients doing EAP-MD5 password-based authentication. 4: <p/> 5: In a next step the <b>RFC 7171 PT-EAP</b> transport protocol is used within the EAP-TTLS 6: tunnel to determine the state of <b>carol</b>'s and <b>dave</b>'s operating system via the 7: <b>TNCCS 2.0 </b> client-server interface compliant with <b>RFC 5793 PB-TNC</b>. The OS IMC 8: and OS IMV pair is using the <b>IF-M 1.0</b> measurement protocol defined by <b>RFC 5792 PA-TNC</b> 9: to exchange PA-TNC attributes. 10: <p/> 11: <b>carol</b> sends information on her operating system consisting of the PA-TNC attributes 12: <em>Product Information</em>, <em>String Version</em>, and <em>Device ID</em> up-front 13: to the Attestation IMV, whereas <b>dave</b> must be prompted by the IMV to do so via an 14: <em>Attribute Request</em> PA-TNC attribute. <b>dave</b> is instructed to do a reference 15: measurement on all files in the <b>/bin</b> directory. <b>carol</b> is then prompted to 16: measure a couple of individual files and the files in the <b>/bin</b> directory as 17: well as to get metadata on the <b>/etc/tnc_confg</b> configuration file. 18: <p/> 19: Since the Attestation IMV negotiates a Diffie-Hellman group for TPM-based measurements, 20: the mandatory default being <b>ecp256</b>, with the strongswan.conf option 21: <b>mandatory_dh_groups = no</b> no ECC support is required. 22: <p> 23: <b>carol</b> passes the health test and <b>dave</b> fails because IP forwarding is 24: enabled. Based on these assessments which are communicated to the IMCs using the 25: <em>Assessment Result</em> PA-TNC attribute, the clients are connected by gateway <b>moon</b> 26: to the "rw-allow" and "rw-isolate" subnets, respectively. 27: </p>