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Re: [v6ops] A proposal for draft-ietf-6man-rfc4291bis-07 - FE80:: means FE80::/9

Alexandre Petrescu <alexandre.petrescu@gmail.com> Tue, 07 March 2017 21:19 UTC

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Subject: Re: [v6ops] A proposal for draft-ietf-6man-rfc4291bis-07 - FE80:: means FE80::/9
To: ipv6@ietf.org
References: <CAN-Dau17q_BrUuzfvB1mLDt6p5UxYikphWaHpa8VQ2L-3kx-DA@mail.gmail.com> <m1cjviu-0000EYC@stereo.hq.phicoh.net> <5BC57F0E-50FD-4452-853F-A08291C91EB1@google.com> <m1ck5mu-0000GaC@stereo.hq.phicoh.net> <5B4AFF50-8CA9-4134-8CE2-A383DB5F8BF5@google.com> <m1ckxfo-0000IMC@stereo.hq.phicoh.net> <225F639E-27C1-4408-BC2B-26500929049B@google.com> <CAOSSMjUR203+hYFBrFBrj9Xkjux3o7fYNd4y9kNyxwpLxF11ew@mail.gmail.com> <6D825351-7F43-4540-89AB-48DC2B5E92E3@google.com> <CAOSSMjUP6m-L1iNhE=BxHW+7hvt4YsZgxxtVn+qmgEVS9HeStA@mail.gmail.com> <CAJE_bqfpE-NWwG12S4CXM+ZnHdHHH31-y+_+pYhuCuq2FtqZ4w@mail.gmail.com> <6f532a72-a142-5d84-f351-c38cba5230d! d@gmail.c om> <5773AF65-4E7E-43B6-BCB1-26F6E9CD3C60@steffann.nl! > <fdc3fa b6-fdcb-f390-e6ea-d9e49edacf52@gmail.com> <7A10E8D9-02F4-4D1C-B422-86ACCAABCB38@steffann.nl> <b86627e7-366! 8-304f-f1 2e-71ad3bfd6f7a@gmail.com> <1F674D50-1C89-444C-A617-C528951F80EC@steffann.nl> <6f2b4f35-8501-f9d8-e2f6-9e545419fb76@gmail.com>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Tue, 07 Mar 2017 22:19:21 +0100
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Thanks to this discussion, I would like to promote the following fact 
that I did not know:

If you say "FE80::" without telling the prefix length, that actually 
means "FE80::/9" (and not FE80::/10, nor FE80::/64).  Because 0xFE80  is 
"1111 1110 1000 0000" in binary representation.

Alex


Le 07/03/2017 à 19:49, Alexandre Petrescu a écrit :
>
>
> Le 07/03/2017 à 17:38, Sander Steffann a écrit :
>> Hi,
>>
>>>> In step 3 the N rightmost bits of that are overwritten with the
>>>> N-bits-long IID.
>>>
>>> YEs, that covers the 64bit rightmost part.  But that does not say
>>> what to put between /10 and /64.
>>
>> Yes it does. In whatever way you read it those bits contain 0.
>
> Here it goes: FE80:1::1 does not contain 0s.
>
> Nothing can stop me from putting a 1 there.
>
> The RFCs should get corrected.
>
>> I'm going to stop this thread, this discussion is going nowhere...
>> You seem to have made up your mind that you *want* to interpret the
>> RFCs in a way that doesn't make sense, and it's not my job to fix
>> that...
>
> "prefix FE80::0" is incorrect please remove that from that RFC.  Say
> "prefix FE80::/10" instead.
>
> Alex
>
>>
>> Cheers, Sander
>>
>
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