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The Changing Usage of a Mature Campus-wide Wireless Network

The Changing Usage of a Mature Campus-wide Wireless Network. Andrew Stone. CS525m – Mobile and Ubiquitous Computing. Overview. Project Goal Data Collection Methods Findings and Data Analysis Conclusions and Recommendations. Project Goal.

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The Changing Usage of a Mature Campus-wide Wireless Network

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  1. The Changing Usage of a Mature Campus-wide Wireless Network Andrew Stone CS525m – Mobile and Ubiquitous Computing

  2. Overview • Project Goal • Data Collection Methods • Findings and Data Analysis • Conclusions and Recommendations Worcester Polytechnic Institute

  3. Project Goal • Compare WLAN network usage statistics at Dartmouth college from fall 2001 and 2003/2004 • Number and type of devices • Applications in use • Better understand user behavior Worcester Polytechnic Institute

  4. Networked Devices • Voice over IP • PBX converted to VoIP in 2003 • Softphones and VoIP phones • Client Devices • Laptops, PDAs, phones, etc identified by using tcpdump traces and an OS fingerprinting tool (p0f) Worcester Polytechnic Institute

  5. Networked Devices Worcester Polytechnic Institute

  6. Data Collection (2001) • Analysis of a Campus-wide Wireless Network (2001)http://users.wpi.edu/~astone/mobilecomputing/kotzwlananalysis.pdf • 476 802.11b APs over 161 buildings • 430 were tracked • 115 Subnets • Syslog tracking started before • Contains authentication, association, and roaming information • AP SNMP Polling for Client specific counters • MAC, IP, Signal Strength, traffic info Worcester Polytechnic Institute

  7. Data Collection (2003) • 566 APs over 188 buildings • <115 Subnets (started using VLANs) • >75% of undergrads own laptops • VOIP phone records • 18 sniffers covering 121 APs (most popular areas from 2001) Worcester Polytechnic Institute

  8. Data Collection • 2001 • Over 1700 different wireless cards • 11 week period • 2003 • Over 7000 different wireless cards • 17 week period Worcester Polytechnic Institute

  9. Definitions • Card, Session, Active card, Active AP, Roam, Roaming Session, Roamer Card, Inbound, Outbound • Mobile session, Mobile card Worcester Polytechnic Institute

  10. Mobile Session Distance between any two APs in a session > ab, bc, cd, da, ac, or bd Worcester Polytechnic Institute

  11. Questions asked • Has the population grown? • Have usage patterns changed? • Where do users visit? Worcester Polytechnic Institute

  12. Has the population grown? Worcester Polytechnic Institute

  13. Active cards per day (2001) Worcester Polytechnic Institute

  14. Active cards per day (2003) Worcester Polytechnic Institute

  15. Active cards per hour (2001) Worcester Polytechnic Institute

  16. Active cards per hour (2003) Worcester Polytechnic Institute

  17. Heavy User Distribution Worcester Polytechnic Institute

  18. Average active days per week per user Worcester Polytechnic Institute

  19. Average active days per week per user Worcester Polytechnic Institute

  20. Active APs per day Worcester Polytechnic Institute

  21. Active APs per day Worcester Polytechnic Institute

  22. Average Active cards per active AP per day Worcester Polytechnic Institute

  23. Average Active cards per active AP per day Worcester Polytechnic Institute

  24. Max cards per hour, for busiest buildings Worcester Polytechnic Institute

  25. Max cards per hour, for busiest buildings Worcester Polytechnic Institute

  26. Daily Traffic (GB) Worcester Polytechnic Institute

  27. Daily Traffic (GB) Worcester Polytechnic Institute

  28. Worcester Polytechnic Institute

  29. Total traffic Worcester Polytechnic Institute

  30. Total Traffic Worcester Polytechnic Institute

  31. Near/Far Traffic Worcester Polytechnic Institute

  32. Near/Far Traffic Worcester Polytechnic Institute

  33. Average daily traffic per AP, by AP category Worcester Polytechnic Institute

  34. Average daily traffic per AP, by AP category Worcester Polytechnic Institute

  35. VoIP calls by hour Worcester Polytechnic Institute

  36. VoIP CCDF of call duration Worcester Polytechnic Institute

  37. P2P Total Traffic Worcester Polytechnic Institute

  38. P2P Near/Far Traffic Worcester Polytechnic Institute

  39. Streaming Media Total Traffic Worcester Polytechnic Institute

  40. Streaming Media Near/Far Traffic Worcester Polytechnic Institute

  41. MobilityTime spent at home location Worcester Polytechnic Institute

  42. Mobile Session duration Worcester Polytechnic Institute

  43. MobilitySession diameter, distribution across sessions, by application Worcester Polytechnic Institute

  44. Conclusions and Recommendations • Found dramatic increase in usage and change in applications • Because the majority of users stay in their home location network caching and prediction-based schemes may be beneficial • Device profiling: single VLAN campus wide for VoIP and PDA devices and building subnets for laptops • Compare wireless usage against wired usage Worcester Polytechnic Institute

  45. Future Work • WLAN moving to 802.11a/b/g • Campus Cable TV network migrating to IP-based streaming video • Wireless sniffers Worcester Polytechnic Institute

  46. Thoughts and Questions? Worcester Polytechnic Institute

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