IPv6 – ISATAP Tunneling
The Intra-Site Automatic Tunnel Address Protocol (ISATAP). ISATAP views the IPv4 infrastructure as one virtual link between IPv6 networks. Similar to automatic and 6over4 tunnelling this technique uses an IPv4 address as its unique identifier.
The IPv4 address is placed in the last 32 bits of the IPv6 address. ISATAP supports both dynamic and manual configuration of addresses. The IPv4 address at the end of the v6 address has only has to be unique within the network it is deployed within. An ISATAP address is identified by the prefix :0:5EFE:x.x.x.x. The 00-00-5E portion is an OUI (Organisational Unit Identifier) and the FE is assigned by IANA which means that an IPV4 address is embedded within an IPv6 address, these two together make the prefix of 0::5EFE. The IPv4 address is automatically embedded within the v6 address or can also be manually configured. ISATAP addresses can communicate with 6bone hosts through ISATAP routers or even 6-to-4 routers.
