The most important challenge faced by current IPv6 networks is to attract more users. Our data analysis of traces from exit points of CERNET2 shows that the traffic in this network has increased a lot during last five months. In this paper, we try to find the incentives of IPv6 users by identifying host communities and studying their properties. We reveal that popular services on CERNET2 are Web, FTP and VOD. FTP and VOD are the killer applications in terms of traffic volume while Web produces the largest number of flows. By analyzing behaviors of end hosts, we discover that hosts form many communities. These communities have different flow-level topologies and various interests in services. Using IPv6 prefixes assignment data, we perform demographic study of IPv6 usage. By presenting CERNET2 usage from various perspectives, we believe this study provides insight into further deployment of IPv6.
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