The Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) connects IPv6
hosts/routers over IPv4 networks. ISATAP views the IPv4 network as a link
layer for IPv6 and views other nodes on the network as potential IPv6
hosts/routers. ISATAP supports an automatic tunneling abstraction similar
to the Non-Broadcast, Multiple Access (NBMA) model.
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