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Interpreting Network Traffic Flows

Interpreting Network Traffic Flows

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Interpreting Network Traffic Flows

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  1. Interpreting Network Traffic Flows Bill Jensen, Paul Nazario and Perry Brunelli

  2. Agenda 1. How did we get here 2. Network monitoring tools 3. Sample graphs

  3. Napster • Shawn Fanning • http://www.time.com/time/magazine/articles/0,3266,55730,00.html

  4. Taming Bandwidth Hogs . . . How can your campus do it? Ana Preston, University of Tennessee Linda Roos, University of Nebraska, Lincoln Tuesday, 11:45, Marquis 4

  5. www.funnytimes.com

  6. A simple question • CIO requested that we estimate Internet transit requirements for the next 18 months

  7. Sources • www.research.att.com/~amo/doc/networks.html • http://www.research.microsoft.com/~Gray/Moore_Law.html

  8. What are current bandwidth requirements? What do we receive from our provider?

  9. A few words about UW Internet access • WiscNet is a state education-based ISP - founded with help from UW-Madison • Charter membership included 14 UW-System universities and 8 privates colleges • WiscNet now serves over 500 educational institutions - predominantly K-12

  10. The WiscNet backbone • Comprised of OC-3 links connecting UW- Madison, UW-Milwaukee, the Chicago NAP and the Ameritech Advanced Data Service Center (AADS), also in Chicago.

  11. WiscNet Services • Internet transport and transit • Internet 2 transport • Peering transport at AADS

  12. Current bandwidth requirements continued... • Inbound vs. outbound traffic • Usage caps • Prime time usage • Peering and I2 traffic • Effect of peer-to-peer networking and future policy on usage/fair utilization

  13. www.wiscnet.net

  14. What is a flow? • Host-to-host conversation between that includes the IP address and port # for each host. • Representation of a series of packets traveling between two end-points. • A unidirectional series of IP packets of a given protocol, traveling between a source and destination within a certain period of time.

  15. Flow as represented by log • Easy to think of it as we would a sniffer trace - bits and bytes seen traversing the wire • In actuality, the flows are the accounting record or log of activity as reported by the router

  16. Measurement Tools - Flowscan • Flowscan - freely available perl scripts and modules that aggregate other freely available tools for representing flows • Analyzes and reports on NetFlow data collected by CAIDA’s clfowd • Stored using RRDtool - time series data • Flowscan provides reporting capabilities and visualization of flow data

  17. Example • cflowd receives flow data from the router and writes it to disk. • Flowscan parses/messages data from cflowd and stores the results in RRD format. • RRDtool graph produces graphs from RRD files.

  18. Dave -> More on FlowScan plonka@doit.wisc.edu See http://net.doit.wisc.edu/~plonka/lisa/FlowScan/ http://mil.doit.wisc.edu/~plonka/

  19. General Flowscan Graphs

  20. Network Events Captured by FlowScan

  21. New Development wwwstats.net.wisc.edu/CampusIO/top/originAS.html wwwstats.net.wisc.edu/CampusIO/top/128.104.16.0_22_top.html

  22. “It’s easier to ride a horse in the direction it’s going” Daniel Burrus www.burrus.com