Method and device for detecting connectivity termination of internet protocol version 6 access networks

A device (400) for detecting whether a connectivity between a subscriber terminal and an access node is terminated in an IPv6 access network, said IPv6 access network comprising said access node and at least one said subscriber terminal, said access node storing a neighbor cache list, and an entry of said neighbor cache list including an “IPv6 address” field and a “Neighbor_State” field, characterized in comprising:

• processing means (401) for creating an entry of the subscriber connectivity cache list when the IPv6 connectivity between said subscriber terminal and said access point is established successfully, querying the entry of said neighbor cache list corresponding to said subscriber terminal when the polling time expires, deciding whether the connectivity of said subscriber terminal is normal based on the information stored in said subscriber connectivity cache list and said neighbor cache list, and performing termination processing on the connectivity of said subscriber terminal logging off abnormally;
• storing means (402) for storing said subscriber connectivity cache list;
• and
• time counting means (403) for time counting based on the time set in the “Polling_Time” field in the entry of said subscriber connectivity cache list.