Nowadays, the IPv6 protocol is in a transition phase in operational networks. The ratio of its traffic volume is increasing day by day. The many provided facilities for IPv6 connection increase the total IPv6 traffic load. IPv6-over-IPv4 tunnels, pilot programs to provide IPv6 connections, IPv6/IPv4 dual stack operating systems, and free IPv6 tunnel brokers cause the IPv6 protocol to expand quickly. For efficient resource utilization, the characteristics of network traffic should be determined accurately. Many traffic characterization,studies regarding IPv4 have demonstrated that most of the network traffic is self-similar. Self-similarity causes significant impacts on network performance. With the increasing volume of IPv6 traffic, the characteristics of IPv6 traffic and differences between traffic in terms of characterization should be explicitly revealed.