Characterizing the Global Impact of P2P Overlays on the AS-Level Underlay -- Investigating Occurrence of Duplicate Updates in BGP Announcements -- A Measurement Study of the Origins of End-to-End Delay Variations -- Yes, We LEDBAT: Playing with the New BitTorrent Congestion Control Algorithm -- Measuring and Evaluating TCP Splitting for Cloud Services -- The Myth of Spatial Reuse with Directional Antennas in Indoor Wireless Networks -- Influence of the Packet Size on the One-Way Delay in 3G Networks -- An Experimental Performance Comparison of 3G and Wi-Fi -- Extracting Intra-domain Topology from mrinfo Probing -- Quantifying the Pitfalls of Traceroute in AS Connectivity Inference -- Toward Topology Dualism: Improving the Accuracy of AS Annotations for Routers -- The RIPE NCC Internet Measurement Data Repository -- Enabling High-Performance Internet-Wide Measurements on Windows -- MOR: Monitoring and Measurements through the Onion Router -- Evaluating IPv6 Adoption in the Internet -- Internet Usage at Elementary, Middle and High Schools: A First Look at K-12 Traffic from Two US Georgia Counties -- A First Look at Mobile Hand-Held Device Traffic -- A Learning-Based Approach for IP Geolocation -- A Probabilistic Population Study of the Conficker-C Botnet -- Network DVR: A Programmable Framework for Application-Aware Trace Collection -- OpenTM: Traffic Matrix Estimator for OpenFlow Networks -- Web Timeouts and Their Implications -- A Longitudinal View of HTTP Traffic.

The 2010 edition of the Passive and Active Measurement Conference was the 11th of a series of successful events. Since 2000, the Passive and Active M- surement (PAM) conference has provided a forum for presenting and discussing innovative and early work in the area of Internet measurements. PAM has a tradition of being a workshop-like conference with lively discussion and active participation from all attendees. This event focuses on research and practical applications of network measurement and analysis techniques. This year’s c- ference was held at ETH Zurich, Switzerland. PAM 2010 attracted 79 submissions. Each paper was carefully reviewed by at leastthreemembersoftheTechnicalProgramCommittee.Thereviewingprocess ledtotheacceptanceof23papers.Thepaperswerearrangedinninesessionsc- ering the following areas: routing, transport protocols, mobile devices, topology, measurement infrastructure, characterizing network usage, analysis techniques, tra?c analysis, and the Web. We are very grateful to Endace Ltd. (New Zealand), Cisco Systems Inc. (USA), armasuisse (Switzerland) and the COST Action TMA whose sponsoring allowedustokeepregistrationcostslowandto o?erseveraltravelgrantsto PhD students. We are also grateful to ETH Zurich for sponsoring PAM as a host.