NTS6: IPv6 based Network Topology Service System of CERNET2

In this paper, we propose NTS6, an IPv6 based network topology service system, which provides a query and response service of network topology information between any pair of hosts accessing IPv6 Internet via CERNET2. The NTS6 system periodically collects the latest OSPF, BGP and SNMP information of CERNET2. Based on these information, NTS6 provides network topology information such as net distance, available bandwidth and path packet loss in response to users´ query. The real-world experiment on CERNET2 confirms the accuracy of our system. Also, NTS6 now performs well on large deployed maze P2P file-sharing system. We believe NTS6 will be a powerful middleware for other applications.