Adam Rosenstein
Abstract
The archie[1] system is a replicated, centralized directory server for all Anonymous FTP sites in the Internet. This centralized approach has not scaled well. The march[2] system provides an alternate solution, using IP Multicast to distribute directory queries directly to FTP hosts. march suffers from highly redundant broadcast messages during expanding-disc search. We propose a solution to the problem of multicast flooding during expanding-disc searches by utilizing an automatically-configured hierarchy of query servers. This system, dubbed MASH, confines the multicast flooding primarily to those nodes at the frontier of each new search radius. We provide a mechanism and protocol for building a self-organizing, two-level hierarchy of MASH servers. We also provide an experimental implementation built on march[5].
- {1} A. Emtage and P. Deutsch. "Archie: An electronic directory service for the Internet." Proceedings of the Winter 1992 Usenix Conference, pages 93-110, January, 1992.Google Scholar
- {2} Kashima, Hiroaki, et. al. "Searching Internet Resources Using IP Multicast." INET '95, August, 1995.Google Scholar
- {3} Rovers, Perry. "Anonymous FTP Frequently Asked Questions List." Copyright 1993-1995, Perry Rovers. FTP Host: rtfm.mit.edu, Directory: /pub/usenet/news.answers/ftp-list/faq.Google Scholar
- {4} Deering, S. "Host Extensions for IP Multicasting." Request for Comments 1112, August 1989.Google Scholar
- {5} Rosenstein, Li, and Tong. "The Multicasting Archie Server Hierarchy." Project Home-Page. URL: http://www.cs.ucla.edu/~adam/mash.html.Google Scholar
- {6} "ns-2: The LBNL Network Simulator," Lawrence Berkeley National Laboratory, URL: http://www-nrg.ee.lbl.gov/ns/#version2Google Scholar
Index Terms
- MASH: the multicasting Archie server hierarchy
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