Projects

The following is an out-of-date list of projects I was involved with at AT&T Research. I have been too busy to put new projects into the list.

HEALERS

Detecting errors and vulnerabilities in large software systems is a challenging task, especially when the source code is not available. The HEALERS project investigates an innovative approach to discover errors in the software based on automated fault-injection experiments. It then generates a protection wrapper that can provide transparent protection to the software. A major advantage of this approach is that it is highly automated and can easily be applied by ordinary users with little domain specific knowledge.

Client-Side Includes

Client-Side Inclusion (CSI) is a technology that allows dynamic Web page assembly from individual fragments at the Web browser. By reusing cached copies of unchanged fragments, CSI reduces the amount of data sent from the Web site to the browser and thereby lowers the download time of the page, especially for narrowband clients.

Application CDN

An Application Content Delivery Network (CDN) improves the performance of accesses to dynamic content generated by computer applications. The system includes novel algorithms for automatic redeployment of applications on networked servers as required by changing demand and for distributing client requests among application replicas based on their load and proximity. The system also incorporates a mechanism for keeping application replicas consistent in the presence of developer updates to the content.

BGP Routing Stability

The Border Gateway Protocol (BGP) plays a crucial role in the delivery of traffic in the Internet. This project studies the correlation between traffic volumes and BGP routing stability. Our results show that the small number of popular destinations responsible for the bulk of Internet traffic have remarkably stable BGP routes. The vast majority of BGP instability stems from a small number of unpopular destinations.

RRMP

RRMP is a Randomized Reliable Multicast Protocol that achieves superior scalability and performance within the existing IP multicast framework. Compared with traditional tree-based protocols, RRMP achieves better load balancing by diffusing the responsibility of error recovery among all members in the group and improves the robustness of the system against process failures.