US Patents

US PTO Search

  1. 9,680,877:  N. Duffield, P Haffner, B. Krishnamurthy, H. Ringberg, Systems and methods for rule-based anomaly detection on IP network flow, June 13, 2017
  2. 9,571,366: N. Duffield, P. Barford, A. Ron, J. Sommers, Method and apparatus for providing a measurement of performance for a network. February 14, 2017
  3. 9,407,527: N. Duffield, B. Krishnamurthy, System and method for inferring traffic legitimacy through selective impairment, August 2, 2016
  4. 9,349,102: S. Sen, N. Duffield, P. Haffner, J. Erman, Y. Jin.  Scalable traffic classifier and classifier training system, May 24, 2016.
  5. 9,343,063: N.G. Duffield. System and method for customized voice response. May 17, 2016.
  6. 9,258,217: N. Duffield, P. Haffner, B. Krishnamurthy, H. Ringberg, Systems and methods for rule-based anomaly detection on IP network flow, February 9, 2016
  7. 9,116,958: G. Cormode, E. Cohen, N.G Duffield, Methods and apparatus to sample data connections, August 25, 2015
  8. 9,106,550: N. Duffield, B. Krishnamurthy, System and method for inferring traffic legitimacy through selective impairment, August 11, 2015
  9. 8,935,188: N. Duffield, P. Haffner, Y. Jin, S. Sen, Z.-L. Zhang,  Method and apparatus for classifying applications using the collective properties of network traffic in a traffic activity graph, January 13, 2015.
  10. 8,811,395: A. Gerber, L. Breslau, S. Sen, N. Duffield, C. Lund, C. Ee, A. Dhamdhere, System and method for determination of routing information in a network, August 19, 2014.
  11. 8,804,565: V. Arya, N. Duffield, D. Veitch, Multicast-based inference of temporal loss characteristics in packet data networks. August 12, 2014.
  12. 8,751,431: N. Duffield, B. Krishnamurthy. System and method for inferring traffic legitimacy through selective impairment.  June 10, 2014.
  13. 8,730,807: C. Chase, N. Duffield, A. Greenberg, O. Spatscheck, J.E. Van der Merwe, N.  Shackleton. Systems, methods, and devices for monitoring networks.  May 20, 2014.
  14. 8,477,772: A. Gerber, L. Breslau, S. Sen, N. Duffield, C. Lund, C. Ee, A. Dhamdhere. System and method for determination of routing information in a network. July 2, 2013.
  15. 8,442,827:  N. Duffield. System And Method For Customized Voice Response, May 14, 2012
  16. 8,311,956:  S. Sen, N. Duffield, P. Haffner, J. Erman, Y. Jin. Scalable Traffic Classifier And Classifier Training System, November 13, 2012
  17. 8,233,402: S. Sen, N. Duffield, P. Haffner, J. Erman, Y. Jin. Multicast-Based Inference Of Temporal Loss Characteristics In Packet Data Networks, July 31, 2012
  18. 8,228,818: C. Chase, N. Duffield, A. Greenberg, O. Spatscheck, J.E. Van der Merwe, N.  Shackleton. Systems, methods, and devices for monitoring networks.  July 24, 2012.
  19. 8,218,451: N. Duffield, C. Lund, S. Sen, Y. Zhang, S. Singh. Methods and apparatus for detection of hierarchical heavy hitters. July 10, 2012.
  20. 8,195,710: E. Cohen, N. Duffield, H. Kaplan, C. Lund, M. Thorup. Method For Summarizing Data In Unaggregated Data Streams. June 5, 2012
  21. 8,165,019: L. Breslau, A. Dhamdhere, N. Duffield, C. Ee, A. Gerber, C. Lund, S. Sen.
    Indirect measurement methodology to infer routing changes using statistics of flow arrival processes. April 24, 2012.
  22. 8,121,599: A. Gerber, N. Duffield, R. Manzo, W. Ramirez. System And Method For Inferring Wireless Trajectories In A Cellular Telephone Network, February 21, 2012
  23. 8,073,945J. Sommers, N. Duffield, P. Barford. Method And Apparatus For Providing A Measurement Of Performance For A Network, December 6, 2011
  24. 8,064,359: N. Duffield, L. Breslau, C. Ee, A. Gerber, C. Lund, S. Sen. System And Method For Spatially Consistent Sampling Of Flow Records At Constrained, Content-Dependent Rates, November 22, 2011
  25. 8,031,599: N. Duffield, M. Roughan, S. Sen, O. Spatscheck. Statistical, signature-based approach to IP traffic classification. October 4, 2011.
  26. 8,028,055: N. Duffield, C. Lund, M. Thorup. Optimal Combination Of Sampled Network Measurements, September 27, 2011
  27. 8,005,949: N. Duffield, C. Lund, M. Thorup, E. Cohen, H. Kaplan. Variance-Optimal Sampling-Based Estimation Of Subset Sums, August 23, 2011
  28. 8,005,010: N. Duffield, C. Lund, M. Thorup, E. Cohen, H. Kaplan. Method And Apparatus For Providing Performance Measurement For A Network Tunnel, August 23, 2011
  29. 8,001,601: N.G Duffield, J.E. van der Merwe, V. Sekar, O. Spatscheck. Method and apparatus for large-scale automated distributed denial of service attack detection. August 16, 2011.
  30. 7,990,982: N. Duffield, C. Lund, M. Thorup, E. Cohen. Methods and apparatus to bound
    network traffic estimation error for multistage measurement sampling and aggregation. August 2, 2001.
  31. 7,957,315:  N. Duffield, L. Breslau, C. Ee, A. Gerber, C. Lund, S. Sen. System and method for
    sampling network traffic. June 7, 2011.
  32. 7,953,020:  L. Breslau, N. Duffield, S. Sen. Method For Implementing And Reporting One-Way Network Measurements, May 31, 2011
  33. 7,924,739: S. Sen, L. Breslau, N. Duffield, Y. Gu. Method And Apparatus For One-Way Passive Loss Measurements Using Sampled Flow Statistics, April 12, 2011
  34. 7,898,976: N. Duffield, C. Lund, S. Sen, Y. Zhang, S. Singh. Method And Apparatus For Detection Of Hierarchical Heavy Hitters, March 1, 2011
  35. 7,852,785:  C. Lund, E. Cohen, N. Duffield, A. Gerber, A. Hersh, O. Spatscheck, M. Thorup, F. True. Sampling And Analyzing Packets In A Network, December 14, 2010
  36. 7,764,625:  N. Duffield, E.Cohen, H. Kaplan, C. Lund, M. Thorup. Algorithms And Estimators For Summarization Of Unaggregated Data Streams, July 27, 2010
  37. 7,746,808: N. Duffield, E. Cohen, H. Kaplan, C. Lund, M. Thorup. Algorithms And Estimators For Summarization Of Unaggregated Data Streams, June 29, 2010
  38. 7,660,248: N. Duffield, M. Roughan, S. Sen, O. Spatscheck. Statistical, Signature-Based Approach To IP Traffic Classification, February 9, 2010
  39. 7,630,949: N. Duffield, B. Krishnamurthy. System and method for inferring traffic legitimacy through selective impairment. December 8, 2009.
  40. 7,587,761: N. Duffield, W. Gong, D. Towsley, C. Zou. Adaptive Defense Against Various Network Attacks, September 8, 2009
  41. 7,574,506:  N. Duffield, A. Greenberg, J.G. Klincewicz, M. Roughan, Y. Zhang. Traffic Matrix Estimation Method And Apparatus, August 11, 2009
  42. 7,536,455: N. Duffield, C. Lund, M. Thorup. Optimal Combination Of Sampled Measurements, May 19, 2009
  43. 7,508,769:  N.G. Duffield, M. Grossglauser. Consistent Sampling For Network Traffic Measurement, March 24, 2009
  44. 7,437,385:  N. Duffield, C. Lund, S. Sen, Y. Zhang, S. Singh. Methods and apparatus for detection of hierarchical heavy hitters, October 14, 2008
  45. 7,424,489: N.. Duffield, C. Lund, S. Sen, Y. Zhang. US Patent 7,424,489: Methods
    and apparatus for space efficient adaptive detection of multidimensional hierarchical heavy hitters. September 9, 2008.
  46. 7,299,283:  N. Duffield,  C. Lund, M. Thorup. Apparatus for size-dependent sampling for managing a data network, November 20, 2007
  47. 7,293,086: N. Duffield, A. Greenberg, J.G. Klincewicz, M. Roughan, Y. Zhang. Traffic matrix estimation method and apparatus, November 6, 2007
  48. 7,197,048: N. Duffield,  A. Greenberg, P. Goyal, P. Mishra, K.K. Ramakrishnan, J.E. van der Merwe. Virtual private network, March 27, 2007
  49. 7,080,136: N. Duffield,  C. Lund, M. Thorup. Method and apparatus for size-dependent sampling for managing a data network, July 18, 2006
  50. 6,912,232:  A. Greenberg, P. Goyal, P. Mishra, K.K. Ramakrishnan, J.E. van der Merwe. Virtual Private Network, June 28, 2005
  51. 6,873,600: N. Duffield, M. Grossglauser. Consistent sampling for network traffic measurement, March 29, 2005
  52. 6,452,933:  N. Duffield, T.V. Lakshman, D. Stiliadis. Fair queuing system with adaptive bandwidth redistribution, September 17, 2002
  53. 6,310,857:  N. Duffield, K.K. Ramakrishnan, A.R. Reibman.  Method and apparatus for smoothing and multiplexing video data flows, October 30, 2001