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? Internet No Internet connection: Check with peers

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

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

9. 7DS Bulletin Board System

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

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

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 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 (5) Operator stops the module (6) No more packet modification

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/irtwww.cs.columbia.edu/irt –E-mail: hgs@cs.columbia.eduhgs@cs.columbia.edu