Classification of Access Network Types: Ethernet, Wireless LAN, ADSL, Cable Modem or Dialup? - PowerPoint PPT Presentation

About This Presentation
Title:

Classification of Access Network Types: Ethernet, Wireless LAN, ADSL, Cable Modem or Dialup?

Description:

Advanced Computer Networks. Classification of Access Network ... Wei Wei, Bing Wang, Chun Zhang, Jim Kurose, Don Towsley. University of Massachusetts, Amherst ... – PowerPoint PPT presentation

Number of Views:420
Avg rating:3.0/5.0
Slides: 12
Provided by: markj199
Learn more at: http://web.cs.wpi.edu
Category:

less

Transcript and Presenter's Notes

Title: Classification of Access Network Types: Ethernet, Wireless LAN, ADSL, Cable Modem or Dialup?


1
Classification of Access Network Types Ethernet,
Wireless LAN, ADSL, Cable Modem or Dialup?
  • Wei Wei, Bing Wang, Chun Zhang, Jim Kurose, Don
    Towsley
  • University of Massachusetts, Amherst
  • Department of Computer Science

Presented by Mark Johnson
2
Introduction
  • Classify Access Network Type
  • Ethernet (switched and not)
  • WLAN
  • ADSL
  • Cable Modem
  • Dialup
  • Accurate, fast classification from external
    location

3
Background
  • 802.11b Standard WLAN
  • Average transmission overhead of 810ms
  • Wireless station must wait for random backoff
  • DOCSIS (Cable modem)
  • Backoff to send request
  • Ethernet, ADSL, and dialup
  • Dedicated access, no backoff

4
Classification Scheme
  • Two primary measures
  • Inter-arrival time
  • Entropy
  • Method
  • Send n packet pairs
  • Calculate population median inter-arrival ?.5(I)
  • Calculate entropies and

5
Classification Scheme
6
Analytical Basis
  • Assumptions
  • Up to two low bandwidth links
  • M/D/1 queuing
  • Interarrival times at receiver are indicative of
    interdeparture times at sender
  • Theorems
  • Ethernet median and entropy
  • 802.11b median and entropy
  • ADSL, Cable, and Dialup median and entropy

7
Experimental Results
  • Controlled Experiments (small scale)
  • Detection on known University and home
    connections
  • Results mainly as expected median and entropies
    of inter-arrival times fit models

8
Experimental Results
9
Experimental Results
  • Uncontrolled Experiments (large scale)
  • Bandwidth of receiver isnt important
  • Results largely fit expected demarcations
  • 5 DSL connections would erroneously be detected
    as WLANs
  • Criteria for distinguishing low bandwidth
    connections are not clear

10
Experimental Results
11
Experimental Results
  • Combination of mean and entropy gives a good
    classification
  • Distinguishing low speed (ADSL, Cable, dialup)
    connections is not straightforward
  • Connections with a large median usually have a
    large entropy
Write a Comment
User Comments (0)
About PowerShow.com