1. TELECOM ITALIA GROUP P2P-TV Workshop Torino, Jan 2011 Application-Layer Traffic Optimization How did we get here? Where are we going? Enrico Marocco enrico.marocco@telecomitalia.it

2. P2P-TV Application-Layer Traffic Optimization Weekend Planning 2 Portofino Rimini Sorrento Taormina Sanremo

3. P2P-TV Application-Layer Traffic Optimization Network Applications – Client-to-server File transfer, remote shell, web browsing 3 Client Server Resource

4. P2P-TV Application-Layer Traffic Optimization Network Applications – Client-to-server-to-server DNS, email, usenet, messaging 4 Client Server Resource

5. P2P-TV Application-Layer Traffic Optimization Network Applications – Peer-to-peer File sharing, realtime communications 5 Client Server Resource Client Resource

6. P2P-TV Application-Layer Traffic Optimization Network Applications Evolution 6 196019701980199020002010 Client/Server Peer-to-peer...... email file transferfile transfer DNS usenet web browsingweb browsing Skype VoIP BitTorrent Napster Spotify CDN ed2k remote shellremote shell PPLive streaming

7. P2P-TV Application-Layer Traffic Optimization 7 email file transferfile transfer DNS usenet web browsingweb browsing Skype VoIP BitTorrent Napster Spotify CDN ed2k remote shellremote shell PPLive streaming Transaction Target: A host on the Internet Optimization goal: Find the best route from client to server Transaction Target: A replicated resource Optimization goal: Find the best resource instance(s)

8. P2P-TV Application-Layer Traffic Optimization IETF ALTO Working Group Genesis ► “Can ISPs and P2P systems co-operate for improved performance?” V. Aggarwal, A. Feldmann, C. Scheideler (July 2007) ► “Comcast Throttles BitTorrent Traffic. Seeding Impossible,” TorrentFreak (August 2007) ► “Verizon reports P4P can slash P2P's impact on ISPs,” Newsfactor.com (March 2008) ► IETF P2P Infrastructure Workshop (March 2008, Boston, MA, USA) ► Application-Layer Traffic Optimization BoF (July 2008, 72 nd IETF Meeting, Dublin, Ireland) ► IETF Application-Layer Traffic Optimization Working Group formed (October 2008) 8

9. P2P-TV Application-Layer Traffic Optimization IETF ALTO Working Group Goal 9 “[..] design and specify an Application-Layer Traffic Optimization (ALTO) service that will provide applications with information to perform better-than-random initial peer selection”

10. P2P-TV Application-Layer Traffic Optimization ALTO Information Network and Cost Maps 10 http://xkcd.org/195

11. P2P-TV Application-Layer Traffic Optimization ALTO Information Ranking 11

12. P2P-TV Application-Layer Traffic Optimization ALTO Information Maps and Ranking Combined 12

13. P2P-TV Application-Layer Traffic Optimization Status of the IETF ALTO Working Group ► Problem statement: done ► Requirements: ~90% ► Protocol specification: ~70% ► Discovery mechanism: ~50% ► Deployment considerations: ~40% ► CDN use case: ~20% ► Interoperability event for pre-standard implementations planned for July 13

14. P2P-TV Application-Layer Traffic Optimization Experiences ► Several independent implementations ► >= 4 vendors, research labs, universities ► Integration in real applications ► P4P trial ► Comcast, Verizon, Telefonica, AT&T ► China Telecom / Xunlei trial 14

15. P2P-TV Application-Layer Traffic Optimization (Possibly) Waiting for ALTO RIPE ATLAS Initiative 15 http://atlas.ripe.net/

16. P2P-TV Application-Layer Traffic Optimization A Few Pointers ► Application-Layer Traffic Optimization (ALTO) Problem Statement, RFC 5693 ► A Survey on Research on the Application-Layer Traffic Optimization (ALTO) Problem, RFC 6029 ► Comcast's ISP Experiences in a Proactive Network Provider Participation for P2P (P4P) Technical Trial, RFC 5632 ► ALTO and DECADE service trial within China Telecom, http://tools.ietf.org/html/draft-lee-alto-chinatelecom-trial http://tools.ietf.org/html/draft-lee-alto-chinatelecom-trial ► IETF ALTO Working Group, http://datatracker.ietf.org/wg/alto/charter/http://datatracker.ietf.org/wg/alto/charter/ ► RIPE ATLAS Initiative, http://atlas.ripe.net/http://atlas.ripe.net/ 16