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tunneling
option 3 dynamic 6to4 tunneling. not 100% but like 80% but you can pray for answer
There are a number of technologies that can provide IPv6 translation for IPv4 users, most commonly Dual Stack and 6 to 4 tunneling. DUAL STACK involves running both IPv4 and IPv6 on a single router with the router managing the implementation of either protocol as and when necessary. 6 to 4 tunneling encapsulates an IPv6 frame in and IPv4 frame for tansport over an IPv4 network either to its destination address or a network where the IPv4 frame can be discarded.
Teredo tunneling is a computer networking term that gives IPv6 capabilities to servers that are still using IPv4. It can only be used when they have no other connections to IPv6 sites.
IPv4 Mechanisms
32 bits in a IPv4 address
32 bits (for IPv4), or 128 bits (for IPv6).32 bits (for IPv4), or 128 bits (for IPv6).32 bits (for IPv4), or 128 bits (for IPv6).32 bits (for IPv4), or 128 bits (for IPv6).
IPv4 was described in RFC 791 in September 1981.
IPV4 is a kind of IP Address.
Minimal bytes required in IPv4 header are 20 i.e. 20 bytes are mandatory. And total bytes in IPv4 header are 60.
There is no need to disable ipv4 to use ipv6.
Hosts with the same network portion of their IPv4 address.