@TechReport{Dartmouth:TR2001-391, author = {Ammar Khalid}, title = {{A Directory Infrastructure to Support Mobile Services}}, institution = {Dartmouth College, Computer Science}, address = {Hanover, NH}, number = {TR2001-391}, year = {2001}, month = {June}, URL = {http://www.cs.dartmouth.edu/reports/TR2001-391.ps.Z}, comment = { Senior Honors Thesis. Advisor: David Kotz. }, abstract = { Traditional Voice-over-IP applications such as Microsoft NetMeeting assume that the user is on a machine with a fixed IP address. If, however, the user connects to the Internet, via a wireless network, on a handheld device, his IP address frequently changes as he moves from one subnet to another. In such a situation, we need a service that can be queried for the most current IP address of a person whom we wish to contact. In this project, we design and implement such a directory service. The service authenticates all callers and callees, is robust against most host failure, and scales to several thousand registered users. } }