Hia, Asking again I'm working on a an client server application which uses freeradius in back end and a custom build finger print scanner at front, I have to develope a customized VPN Client to dial in to a network, would you please take time and help me find some docs and information on this issue. my problems are: 1- which protocol I have to use and how, I think and radius docs said chap is very good for this purpose but how I can use it to send fingerprint encrypted feature to my server 2- how can I get the feature in the back, have I to customize freeradius core engine ? 3- it's better to use ldap beside my server or mysql is enough ?