I tried to see what kind of features are provided in dialup_admin package. But when I used IE from Window 2000 to view the 'index.html' file, I got some PHP text shown on the left side of the page. Same to other PHP file under the bin directory. The FAQ says something about configuring the web server to handle PHP file with .php3 suffix.
Where do I set such configuration to the web server? (Apache running on RedHat Linux 8.0) - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html
