Permission to make digital or hard copies of all or part of this work
for personal or classroom use is granted without fee provided that the copies
are not made or distributed for profit or commercial advantage and that
the copies bear this notice and full citation on the first page. Copyright
for components of this work owned by others than ACM must be honored. Abstracting
with credit is permitted. To copy otherwise, to republish, to post on servers,
or to redistribute to lists, requires prior specific permission and/or a
fee. Request permission to publish from: Publications Dept. ACM, Inc. Fax
+1 212 869 0481 or email <permissions@acm.org>.
The referenced paper appears in Computer Communication Review, a
publication of ACM SIGCOMM, volume 25, number 5, October 1995. ISSN # 0146-4833.
This electronic facsimile differs slighty from the printed version. It has
been reformated to better support electronic viewing. Therefore, please
use the printed version when referencing layout details, such as page numbers.
This paper is available in Postscript and
Adobe Portable Document Format (PDF)