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How does Windows 7 create IPv6 Link Local Addresses?

    Question

  • My understanding, in essence, of 'Auto-generated' IPv6 Link Local Addresses is that they are derived from the OUI and the DI portions of IEEE 802 MAC address. This is then supplemented by adding FF FE between these respective sections, thus producing the EUI-64 Notation. This in turn is prefixed with the FE80:: to provide the IPv6 Address.

    With that in mind, I am curious about how the Link Local Address found on my Windows 7 PC has been arrived at, as it bears no relationship to the MAC address of the NIC.

    The MAC address is: 00-1D-7D-04-77-6B

    The Link Local Address is: fe80::972:322:9617:bc8d

    Based on the above assumption I would have though the address would have been: fe80::021d 7dff fe04 776b (this has the U/L bit flipped)

    Can anyone clarify this situation please.

    Thanks

     

     

     

     

    Sunday, January 02, 2011 5:36 AM

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