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  • HAN WANG thinks this is interesting:

In this case, we can see a special tunneling interface called ISATAP [RFC5214]. The so-called physical address is really the hexadecimal encoding of an IPv4 address: 0A-99-8D-87 is the same as Here, the OUI used (00-00-5E) is the one assigned to the IANA [IANA]. It is used in combination with the hex value fe, indicating an embedded IPv4 address. This combination is then combined with the standard link-local prefix fe80::/10 to give the address fe80::5efe:


Cover of TCP/IP Illustrated, Volume 1: The Protocols


Example of forming physical address of ISATAP tunneling interface.