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Best Student Paper

First Step Towards Automatic Correction of Firewall Policy Faults

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Exploiting the Hard-Working DWARF: Trojan and Exploit Techniques with No Native Executable Code

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EtE: Passive End-to-End Internet Service Performance Monitoring

Date: 
June 14, 2002 - 9:00 am-10:30 am
Authors: 
Yun Fu::Duke University
Ludmila Cherkasova::Hewlett-Packard Laboratories
Wenting Tang::Hewlett-Packard Laboratories
Amin Vahdat::Duke University

This paper presents, EtE monitor, a novel approach to measuring web site performance. Our system passively collects packet traces from a server site to determine service performance characteristics. We introduce a two-pass heuristic method and a statistical filtering mechanism to accurately reconstruct different client page accesses and to measure performance characteristics integrated across all client accesses. Relative to existing approaches, EtE monitor offers the following benefits: i) a breakdown between the network and server overhead of retrieving a web page, ii) longitudinal information for all client accesses, not just the subset probed by a third party, iii) characteristics of accesses that are aborted by clients, and iv) quantification of the benefits of network and browser caches on server performance. Our initial implementation and performance analysis across two sample sites confirm the utility of our approach.

SWILL: A Simple Embedded Web Server Library

Date: 
June 13, 2002 - 11:00 am-12:30 pm
Authors: 
Sotiria Lampoudi::University of Chicago
David M. Beazley::University of Chicago

We present SWILL, a lightweight programming library that adds a simple embedded web server capability to C and C++ programs. Using SWILL, it is possible to add Internet accessibility to programs that are poorly matched to more traditional methods of web programming such as CGI scripting or web server plugin modules. SWILL also makes it easy for programmers to add web-based monitoring, diagnostics, and debugging capabilities to software not normally associated with internet programming. We like to think of SWILL as an attempt to turn the problem on its head: traditionally, the web server came first, the ``programs'' later; in our approach, the application is written first, and the server integrated last. For some types of applications, this approach is far more painless. In this paper, we provide an overview of the SWILL library and describe how we have used it to provide web access to a variety of applications including scientific simulation software, a compiler, and a hardware emulator for teaching operating systems.