6over4, also referred to as "IPv6 over IPv4 ", is an IPv6 transition mechanism for the transport of data packets between IPv6 dual stack node, which are connected by an IPv4 network. This mechanism requires an IPv4 multicast infrastructure.


In 6over4 a link-local IPv6 address is generated from an IPv4 address. To generate the address following algorithm is used:

FE80 :: / 64:


From the IPv4 Address: 91,198,174,225 following link-local address is derived:

Fe80: 0000:0000:0000:0000:0000: or

Fe80: 0000:0000:0000:0000:0000:5 BC6: AEE1 or short: fe80 :: 5BC6: AEE1

A special mechanism Neighbor Discovery is enabled for IPv4. From the perspective of IPv4 nodes to IPv6 infrastructure is used as the link layer (data link layer in the OSI model ).


  • RFC 2529 Transmission of IPv6 over IPv4 Domains without Explicit Tunnels

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