Internet Real Time IRT Lab at Columbia University

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

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 Vo. IP • He is the lead author for RFC documents on RTP, RTSP, SIP protocols…

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 i. Phone apps!) – Core Internet • P 2 P file protocols: what makes them work • Web architectures • Service discovery

Examples of our work • Two research projects I’ve worked on – 7 DS/Bon. AHA • Wireless transient networks formed by mobile devices meeting each other are getting commonplace • Need a new framework to run applications – Net. Serv: • 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 P 2 P, video streaming, etc.

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

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

Share data from web Times Square? Columbia? SRV : query. _7 ds. _udp TXT : deals TXT : columbia TXT : times square TXT : news TXT : weather TXT : new york “Here is the result for columbia” “Here is the result for times square”

File transfer “I want Word. doc and presentation. ppt” SRV : filesync. _7 ds. _udp TXT : file 1. xml TXT : file 2. xml SRV : filesync. _7 ds. _udp “I want TXT : word. doc File 1. xml and file 2. xml” File 1. xml File 2. xml Word. doc Presentation. ppt TXT : presentation. ppt Word. doc Presentation. ppt File 1. xml File 2. xml

7 DS Bulletin Board System

Net. Serv 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

CDNs: How You. Tube 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

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

On-Path CDNs – On-Path Content Distribution Network – Any Net. Serv node on path can, if it has relevant content, serve content

Demo: Net. Serv 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

Current Work: CDN on Net. Serv • 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

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