Hello Mercier,
According to the Radius RFC, Chapter 2.1 Challenge-response (http://www.ietf.org/rfc/rfc2865.txt), I read that it's possible to activate a challenge-reponse (Access-Request, Access-Challenge, Access-Request, Access-Accept) with Radius, is that possible with Free Radius, and if it's possible how to make this ? I just want to analyze the frame with Wireshark, for the contents of the frames.
it is possible, at least soon it will be for sure. What I learned so far, that it works with pap and only pap. There is commercial radius server otp from nordic edge available with a free evaluation license. I had it running within 10 minutes. Here are the frames for you to analyze in wireshark: http://upload.glanzmann.de/radius.pcap Cheers, Thomas