How to authenticate users from Inter and Intra net

From: A G Benny (asd@asd.com)
Date: 12/24/02 

From: "A G Benny" <asd@asd.com>
Date: Tue, 24 Dec 2002 08:13:59 +0530

hi

i am developing a web based solution which would be used both in the
intranet as well as internet. i don't know what kind of authenticatoin
method to use. should i use Active Directory or a Database oriented method
for it?

lots of thanks
A G Benny