Research Projects

• ALTQ

  Queue management is an essential component in managing network traffic. A large number of queueing disciplines have been proposed to date in order to meet a wide range of requirements. However, FIFO queueing is the only queueing discipline used in traditional UNIX systems.

  The ALTQ project is aimed at providing a flexible queueing platform in order to promote research and operational experience in the field. The ALTQ software release includes a queueing framework and a set of advanced queueing disciplines such as CBQ, HFSC, RED, WFQ BLUE, and RIO. ALTQ also includes traffic conditioning elements for diffserv. The ALTQ release for FreeBSD has been publicly available since March 1997, and used by many groups world wide. NetBSD and OpenBSD are also supported.

  The H-FSC implementation in ALTQ is a joint work with Hui Zhang and his group members at CMU during my stay at CMU in July 1999.

• QoS Policy Management

  Kuma Project is a joint effort to build a QoS policy framework.

• Network Traffic Measurement and Analysis

  Packet trace data is essential to study network dynamics, usage characteristics, and growth patterns, as well as various protocol design. Despite the increasing demands, it is difficult to obtain packet traces, especially at a backbone network. Packet traces could contain user privacy information so that they are usually available only under non-disclosure agreements.

  As a chair of the MAWI (Measurement and Analysis on the WIDE Internet) working group of the WIDE Project, I have been working on building a public traffic trace repository. Our challenges include:

  • collecting packet traces from the WIDE backbone network.
    (sampling method, automation, high-speed packet capturing)
  • creating a large set of publicly available traces by removing or scrambling sensitive information.
    (development of tools and scrambling method)
  • development of tools to analyze and visualize packet traces.
  The WIDE traffic data repository contains packet traces from the WIDE backbone.

• Others

  I'm a board member of the WIDE Project and a development member of the KAME project, the FreeBSD project, and the OpenBSD project.
  I'm also a visiting professor at Japan Advanced Institute of Science and Technology, School of Information Science.