Re: Objection to draft-ietf-6man-rfc4291bis-07.txt

Alexandre Petrescu <alexandre.petrescu@gmail.com> Wed, 01 March 2017 19:47 UTC

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Subject: Re: Objection to draft-ietf-6man-rfc4291bis-07.txt
To: Dan Lüdtke <mail@danrl.com>
References: <20170223134026.GI5069@gir.theapt.org> <58AF726A.3040302@foobar.org> <F7C230DE-4759-4B78-ABF2-6799F85B3C62@google.com> <58B014F6.2040400@foobar.org> <6DA95097-8730-4353-A0C9-3EB4719EA891@google.com> <CAN-Dau0s04c=RV0Y8AGaxBPFui41TWPTB+5o0K2Lj-iah0An1w@mail.gmail.com> <CAL9jLaYirty22iGiEjEaYq3_KA1FZhxBTOBWuFOXQ9C-WPd5xQ@mail.gmail.com> <CAN-Dau0n6oFm538XdJOcuO1yg92BCDD3mBu5YfBVm_+g-gtcKA@mail.gmail.com> <CAL9jLaYO=uYgVfSZ0SoSe0SujJ1xgwEKE8WLzo_keJHywgXTtg@mail.gmail.com> <CAN-Dau1vJV5O_Ythp6THkAu4-YZXV82Upny1V+ybbjCVZQQX=A@mail.gmail.com> <27cce319-18ac-5c0e-3497-af92344f0062@gmail.com> <de4988be-6031-08d9-84ce-21c3fa4f9bc9@gmail.com> <98401ef7-cf41-b4a0-4d11-a7d840181bd0@gmail.com> <1047f5fc-ae40-be52-6bab-27f31fe5e045@gmail.com> <9a94feac-8d59-b153-d41c-04fc371e4db4@gmail.com> <CAO42Z2z7v4gDk91b6Of-1sczV88m3B9kzn0MeJU_VBJ416k6Ww@mail.gmail.com> <ae35b45a-0398-840f-fc0d-1f64dd2fcc58@gmail.com> <92160C59-79EC-4EB0-BFD5-69697A5E1306@danrl.com>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Wed, 01 Mar 2017 20:47:51 +0100
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Le 01/03/2017 à 12:23, Dan Lüdtke a écrit :
>
>> On 28 Feb 2017, at 13:04, Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote:
>>
>> Finally, there is no advice of what bits to put between fe80:: and a
>> 64bit the Interface ID - zeros or ones?  linux says it's a fe80::/64 and
>> IIRC BSD says it's a fe80::/10.  The routing entries based on that can
>> make for interop problems.
>
> I think there is advice. As I understand, /10 is reserved but only /64 is specified.

Sorry, I dont understand that?

What is the difference?  Why reserving X if only specifying Y?  What 
other concept is similar: is there some other number which is reserved 
and only number+1 is specified?

Why couldnt we just reserve without specifying?  Or specifying without 
reserving?

If we continue with reserving _and_ specifying we continue wasting these 
54bits there.

What are these 54bits for?

Alex

>
>
> RFC 4291 IP Version 6 Addressing Architecture
>   2.5.6.  Link-Local IPv6 Unicast Addresses
>
>      Link-Local addresses are for use on a single link.  Link-Local
>      addresses have the following format:
>
>      |   10     |
>      |  bits    |         54 bits         |          64 bits           |
>      +----------+-------------------------+----------------------------+
>      |1111111010|           0             |       interface ID         |
>      +----------+-------------------------+----------------------------+
>
>
> Cheers,
>
> Dan
>