Creating different groups

[Eduardo Bejar]

Hi,

I´m using Freeradius with MySQL authentication and accounting. Ok, if I want
to allow access to a user, I add it to the radcheck table with 

UserName = "username"
Attribute = "Crypt-Password"
Op = "=="
Value = "encryptedpassword"

If I want to deny it I just add

UserName = "username"
Attribute = "Auth-Type"
Op = "=="
Value = "Reject"

Now, my question is, which attribute, op and values should I use to allow
access to a user only between certain hours? Which are the possible values
that the field Attribute can have?

Thanks for your comments,

Edo