6in4

6in4 is an IPv6 transition mechanism for migrating from Internet Protocol version 4 (IPv4) to IPv6. It is a tunneling protocol that encapsulates IPv6 packets on specially configured IPv4 links according to the specifications of RFC 4213. The IP protocol number for 6in4 is 41, per IANA reservation. The similarly named methods 6to4 or 6over4 describe a different mechanism. The 6to4 method also makes use of proto-41, but the endpoint IPv4 address information is derived from the IPv6 addresses within the IPv6 packet header, instead of from static configuration of the endpoints.

6in4

6in4 is an IPv6 transition mechanism for migrating from Internet Protocol version 4 (IPv4) to IPv6. It is a tunneling protocol that encapsulates IPv6 packets on specially configured IPv4 links according to the specifications of RFC 4213. The IP protocol number for 6in4 is 41, per IANA reservation. The similarly named methods 6to4 or 6over4 describe a different mechanism. The 6to4 method also makes use of proto-41, but the endpoint IPv4 address information is derived from the IPv6 addresses within the IPv6 packet header, instead of from static configuration of the endpoints.