> * Is it possible to authenticate Windows Variants (2003,XP and 2000) > clients > without using Windows 2003 AD?
You can set up Windows servers as stand-alone radius clients. You can't do that for XP. You can use Samba instead of AD. > * And how much I can scale (my requirement might go upto 250 boxes in > future) ? There are freeradius implementations with millions of users. One active and one backup server should be quite enough. Ivan Kalik Kalik Informatika ISP - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html