AuthenticationScheme — authentication scheme in radius. Possible parameters:PAP,CHAP,MSCHAPV2. The PAP scheme is insecure.
Using CHAP authentication in windows, it is necessary to enable "Store passwords using reversible encryption" in the user account settings and update the user's password.
AuthenticationUserName —name format for authentication.
Possible parameters:
NameWithoutDomain — name without domain (for authentication in FreeRadius)
SamCompatibleName — name in the format INDEED\\user