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4in6 refers to tunneling of IPv4 in IPv6. It is an Internet interoperation mechanism allowing Internet Protocol version 4 (IPv4) to be used in an IPv6 only network. 4in6 uses tunneling to encapsulate IPv4 traffic over configured IPv6 tunnels as defined in RFC 2473. 4in6 tunnels are usually manually configured but they can be automated using protocols such as TSP to allow easy connection to a tunnel broker.

References

1. Blanchet, Marc (18 May 2009). Migrating to IPv6: A Practical Guide to Implementing IPv6 in Mobile and Fixed Networks. John Wiley and Sons. pp. 345–350. ISBN 9780470468906.
2. Stockebrand, Benedikt (28 November 2006). IPv6 in Practice: A Unixer's Guide to the Next Generation Internet. Springer Science & Business Media. pp. 170–172. ISBN 9783540480013.
3. Conta, Alex; Deering, S. (1998). "RFC 2473: Generic Packet Tunneling in IPv6 Specification". tools.ietf.org. doi:10.17487/RFC2473. Retrieved 17 June 2016.
4. Hagen, Silvia (9 June 2014). Ipv6 Essentials. "O'Reilly Media, Inc.". pp. 228–231. ISBN 9781449335267.

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