On campus we have GTED, the Georgia Tech Enterprise Directory, an LDAP server that stores lots of information about people. Some is public, but a lot of it is private. With a departmental account, you can get a lot of information and feed it into Drupal to automatically set up groups of users.
Lightweight Directory Access Protocol (LDAP) is an open protocol for sharing directory information and can be used as an alternative to CAS to allow users to log in to a web application using their GT Account Username and password. Unless your application doesn't support CAS, it's best to use it instead of LDAP, since LDAP requires obtaining a special GTED LDAP user account for your application.
There is a public-facing LDAP server from which you can pull general directory information from without authentication. This server is only accessible from servers and workstations located on one of the Georgia Tech campus subnets.
Use the default settings, unless otherwise stated beow: