(Tunnel technology is the most important technology in the early stage of the transition from IPv4 network to IPv6 network. According to the method of individual users surfing the Internet, it is divided into NAT Internet users and non-NAT Internet users, and analyzes how different types of users log in to the IPv6 network, for non-NAT Internet users can choose to access IPv6 networks, for NAT Internet users Teredo Tunnel and Tunnel Proxy access to IPv6 network, and finally demonstrate how IPv4 users can log in to IPv6 network.)
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