Modular TCP Handoff Design in STREAMS–Based TCP/IP Implementation

  • Wenting Tang
  • Ludmila Cherkasova
  • Lance Russell
  • Matt W. Mutka
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2094)


Content-aware request distribution is a technique which takes into account the content of the request when distributing the requests in a web server cluster. A handoff protocol and TCP handoff mechanism were introduced to support content-aware request distribution in a client-transparent manner. Content-aware request distribution mechanisms enable the intelligent routing inside the cluster to provide the quality of service requirements for different types of content and to improve overall cluster performance.

We propose a new modular TCP handoff design based on STREAMSbased TCP/IP implementation in HP-UX 11.0. We design the handoff functions as dynamically loadable modules. No changes are made to the existing TCP/IP code. The proposed plug-in module approach has the following advantages: flexibility-TCP handoff functions may be loaded and unloaded dynamically, without node function interruption; modularity- proposed design and implementation may be ported to other OSes with minimal effort.


Network Address Translation Stream Head Request Distribution Initial Sequence Number Card Architecture 
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  1. 1.
    Mohit Aron, Darren Sanders, Peter Druschel and Willy Zwaenepoel. Scalable Content-Aware Request Distribution in Cluster-based Network Servers. In Proceedings of the USENIX 2000 Annual Technical Conference, San Diego, CA, June 2000.Google Scholar
  2. 2.
    L. Cherkasova. FLEX: Load Balancing and Management Strategy for Scalable Web Hosting Service. In Proceedings of the Fifth International Symposium on Computers and Communications (ISCC’00), Antibes, France, July 3–7, 2000, p.8–13.Google Scholar
  3. 3.
    A. Cohen, S. Rangarajan, and H. Slye. One the Performance of TCP Splicing for URL-Aware redirection. In Proceedings of the 2nd Usenix Symposium on Internet technologies and Systems, Boulder, CO, Oct, 1999.Google Scholar
  4. 4.
    V. Pai, M. Aron, G. Banga, M. Svendsen, P. Drushel, W. Zwaenepoel, E. Nahum: Locality-Aware Request Distribution in Cluster-Based Network Servers. In Proceedings of the 8th International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS VIII), ACM SIGPLAN,1998, pp.205–216.Google Scholar
  5. 5.
    X. Zhang, M. Barrientos, J. Chen, M. Seltzer: HACC: An Architecture for Cluster-Based Web Servers. In Proceeding of the 3rd USENIX Windows NT Symposium, Seattle, WA, July, 1999.Google Scholar
  6. 6.
    Data Link Provider Interface (DLPI), UNIX International, OSI Work Group.Google Scholar
  7. 7.
    Transport Provider Interface (TPI), UNIX International, OSI Work Group.Google Scholar
  8. 8.
    T. Brisco: DNS Support for Load Balancing. RFC 1794, Rutgers University, April 1995.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Wenting Tang
    • 1
  • Ludmila Cherkasova
    • 1
  • Lance Russell
    • 1
  • Matt W. Mutka
    • 2
  1. 1.Hewlett-Packard LabsPalo AltoUSA
  2. 2.Dept of Computer Science & EngMichigan State UniverssityEast LansingUSA

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