Henan agricultural informatization center, which is a part of Henan agricultural university campus network and contains nearly 800 host machines, had realized complete coverage of IPv4 network. Considering the long-term transition process from IPv4 to IPv6 and reserving current IPv4 application, the CNGI Customer Premise Network (CPN) in the center was constructed based on IPv6 / IPv4 double protocol stack mode and adopted the access layer, convergence layer and the core layer 3 layers network structure. Both static routing strategy and default routing strategy were used in the network. To plan and allocate the IPv6 addresses, the address planning employed mapping from IPv4 to IPv6 addresses.
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