Pptpd / MySql / MD5

[Sascha Kiefer]

Hi,

Thanks to http://wiki.freeradius.org/PopTop i can authenticate my vpn users
using an remote radius server using MS-CHAPv2
Passwords are stored in clear in the mysql database.
PopTop is responsible for the remoteip.
Everything works. 

Now, is it possible?
* to use md5 passwords in db; i had this in the first place but
authentication failed
* achieve the following: user A is logged in from workstation X; dont let
him log in from workstation Y as long he is logged in from X

Thanks for any hints.

Sascha