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  1. Product Technical Learning
  2. PTL-6567

RH254-373, Chapter 2. Change the Link Local address creation process

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    • RH254 - RHEL 7 2 20150427
    • RH254
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    • en-US (English)

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      Reporter RHNID: p.tselios
      Section: -
      Language: en-US (English)
      Workaround:

      Description: It is already mentioned in another report and is marked as fixed.
      I don't know how is the wording in the new version, but, I explain to my students the creation of Link local address as a 6 steps process:

      1. Take the MAC address 00:11:22:aa:bb:cc
      2. Add ff fe in the middle of it: 00:11:22:ff:fe:aa:bb:cc
      3. Reformat to IPv6 notation: 0011:22ff:feaa:bbcc
      4. Convert the first octet from hexadecimal to binary:
        • 00 → 0000 0000
        • Invert the 7th bit: 00 00 00 00 -> 0000 0010
        • Convert the binary to Hex: 0000 0010 → 2
          2011:22ff:feaa:bbcc
      5. Prepend the link-local prefix: fe80::0011:22ff:feaa:bbcc/64

      Now, I need to explain why on earth we invert this bit, but that's another story.

            rht-sbonnevi Steven Bonneville
            p.tselios Petros Tselios (Inactive)
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