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PPTP with MPPE and EAP-TLS ?

Router Cisco 1812 , 12.4T is a PPTP remote access server, connected with Windows RADIUS server.

PPTP with MPPE works only with MS-CHAPv2.

PPTP with MPPE does not work when using EAP-TLS - works only if you disable MPPE (or set it to auto and set client to no encryption), or there is DUN error 628.

Is there any way to enable EAP-TLS with MPPE (it works on Windows Server)?

Is there any special RADIUS parameter that needs to be set?

debug ppp... brings this:

001008: Dec  2 11:35:32.557 CET: Vi3 MPPC: no encryption keys available, disabli

ng optional MPPE

In RFC3079 it stands that MPPE keys can be derived from TLS session keys?

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