denying users in bulk

Hello, Dear List
Our EZproxy successfully authenticates our users via radius.
sadly I've discovered that inside the database are still -for admin purposes-  some graduates.
As a quick fix, I've thought I can extract their usernames and put them in a single file (say denied.txt)  with the "Deny" action for each of them.
Then I can add the following line on my radius conf in user.txt:

::radius=MY_RADIUS_IP,secret=MY_SECRET
::file=denied.txt

is this idea OK in your opinion?
if yes, how many users can I add on denied.txt?

is there an alternative to my idea for this kind of problem?

Thanks a lot in advance for your reply,

Fabiano


Petrone Fabiano
Università degli Studi di Udine
Direzione Servizi Operativi – Gestionali d’Ateneo / Area biblioteche
tel. +39-432-556256
skype petrone.fabiano
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