Understanding IPv6 user performance on private BT system

The Internet continually evolves in scope and complexity, with wide deployment of backbone links of large capacity, application of IPv6, the emergence of streaming applications, and even the rapid change on nature of the same applications. These changes lead us to question whether users´ performance on the most popular Internet applications such as Bittorrent(BT) under the IPv6 real environment reflect changes or not, and how about the evolution trend of IPv6. To answer these questions, we conduct measurement on a private BT System, which is deployed over a campus network serving more than 25,000 users with three external links connecting to Telecom, CERNET, and CERNET2 (IPv6). With packet traces collected from external links and the 10-month log files from the private tracker, we first analyze the amount and components of IPv6 traffic, we then present in depth measurement and analysis from users group evolution, each group´s status, and level of activity. Furthermore, we find there is gap among performances of users, and figure out such inconsistency is mainly from tracker´s operating mechanism and diversity in users´ network environment, rather than difference in IP protocol.