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Internet Real Time (IRT) Lab at Columbia University

Internet Real Time (IRT) Lab at Columbia University. Professor: Henning Schulzrinne Columbia University Presenter: Suman Srinivasan, PhD student http://www.cs.columbia.edu/irt/. Summary of our work. Lots of interesting research!

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Internet Real Time (IRT) Lab at Columbia University

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  1. Internet Real Time (IRT) Lab at Columbia University Professor: Henning Schulzrinne Columbia University Presenter: Suman Srinivasan, PhD student http://www.cs.columbia.edu/irt/

  2. Summary of our work • Lots of interesting research! • Especially in the area of networking, wireless and Voice-over-IP • Our advisor Dr. Schulzrinne had a key role in the history of VoIP • He is the lead author for RFC documents on RTP, RTSP, SIP protocols…

  3. Summary of our work • List of our projects • Voice-over-IP • Particularly SIP signaling protocol • Wireless networks • How to make them faster (handoffs, etc.) • Mobile apps (yes, we build iPhone apps!) • Core Internet • P2P file protocols: what makes them work • Web architectures • Service discovery

  4. Examples of our work • Two research projects I’ve worked on • 7DS/BonAHA • Wireless transient networks formed by mobile devices meeting each other are getting commonplace • Need a new framework to run applications • NetServ: • Internet core is – believe it or not – “dumb” • Simply transfers packets • If we introduced some “intelligence” into the network, can we make it faster? • Think P2P, video streaming, etc.

  5. What is 7DS? • Use local peer-to-peer wireless networks to exchange information • Peers can get information they do not have from another peer • Once wireless 7DS network set up, it could be used for any purpose • Getting web pages from peers • Sending e-mails • File transfer to selected client

  6. What is 7DS? No Internet connection: Check with peers Internet

  7. Share data from web Times Square? SRV : query._7ds._udp TXT : deals TXT : times square TXT : weather Columbia? SRV : query._7ds._udp TXT : columbia TXT : news TXT : new york “Here is the result for times square” “Here is the result for columbia”

  8. File transfer “I want Word.doc and presentation.ppt” SRV : filesync._7ds._udp TXT : file1.xml TXT : file2.xml Word.doc Presentation.ppt “I want File1.xml and file2.xml” SRV : filesync._7ds._udp TXT : word.doc TXT : presentation.ppt File1.xml File2.xml File1.xml File2.xml Word.doc Presentation.ppt

  9. 7DS Bulletin Board System

  10. NetServ overview Extensible architecture for core network services Modularization • Building Blocks • Service Modules Virtual services framework • Security • Portability NSF FIND four-year project • Columbia University • Bell Labs • Deutsche Telekom • DOCOMO Euro-Labs

  11. CDNs: How YouTube Works Redirects user to closest video server Original HTTP request for video HTTP 301 redirect to Google Video server (CDN) HTTP 301 redirect to IP address

  12. Current CDN Technology • Involves some redirection • Youtube: HTTP redirection • Inefficient “start up” time • In setting up connection to CDN node • From http://upload.wikimedia.org/wikipedia/commons/8/88/Akamaiprocess.png

  13. On-Path CDNs • On-Path Content Distribution Network • Any NetServ node on path can, if it has relevant content, serve content

  14. Demo: NetServ prototype • (1) Regular Incoming packets • (2) “Operator” can view modules on router • (3) Operator loads a new module (that makes all data uppercase) • (4) Packets are modified • (6) No more packet modification • (5) Operator stops the module

  15. Current Work: CDN on NetServ • On-Path CDN • Prototype implemented • Dynamic content migration • Moving content closer to the end user according to demand • Building blocks • Network monitoring • Content discovery • Caching proxy

  16. Summary • Internet Real Time Lab at Columbia University • Presented two research projects • 7DS/BonAHA: wireless, transient networks • NetServ: intelligence in network core • More info: • Web: www.cs.columbia.edu/irt • E-mail: hgs@cs.columbia.edu

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