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Re: [v6ops] A proposal for draft-ietf-6man-rfc4291bis-07 - FE80::/10 and IID length

Alexandre Petrescu <alexandre.petrescu@gmail.com> Wed, 08 March 2017 15:45 UTC

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Subject: Re: [v6ops] A proposal for draft-ietf-6man-rfc4291bis-07 - FE80::/10 and IID length
To: otroan@employees.org
References: <CAN-Dau17q_BrUuzfvB1mLDt6p5UxYikphWaHpa8VQ2L-3kx-DA@mail.gmail.com> <7A10E8D9-02F4-4D1C-B422-86ACCAABCB38@steffann.nl> <1F674D50-1C89-444C-A617-C528951F80EC@steffann.nl> <6f2b4f35-8501-f9d8-e2f6-9e545419fb76@gmail.com> <a11c6b9b-ae5c-7c7d-a71c-cc5d8b80d047@gmail.com> <C689991E-A54D-41FB-BDE6-2BFA74B10049@employees.org> <CAO42Z2xKxe24+d_reyY1rTitA9oPy0=2QSTGSN65t5wFGx51uA@mail.gmail.com> <CAO42Z2yFuuAuEb5=mb8Jwge21nahDhy1uPq-6j7YGnTF9=uM9g@mail.gmail.com> <224F03DD-D876-4288-B48D-04D997ACBE76@employees.org> <CAO42Z2wOCe16Y5u=YNDQ9PRE5dPaEK3kvtFPnZRWOkUfKmZ2xg@mail.gmail.com> <0E14B2F8-4918-4AA0-837F-4D120FAEF17D@employees.org> <425ae5ef-5cfe-5787-c6e5-9c73f09cfb20@gmail.com> <BFD656FE-8613-4D20-9FDA-E0DBEEBB2E54@employees.org> <3a1c572e-4730-1071-27b8-57999aecee5c@gmail.com> <BCE166A5-4B14-432B-825F-BA2E837977DB@employees.org> <f01c049b-9b1a-7ae7-8b63-b625f31ce39a@gmail.com> <A122503C-E155-42DE-A481-73F05F04B8DE@employees.org>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Wed, 08 Mar 2017 16:45:49 +0100
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Le 08/03/2017 à 15:34, otroan@employees.org a écrit :
[...]
>> I dont know where do you see the need to agree on a plen for the LL
>> addresses?  Can I know?
>
> https://tools.ietf.org/html/rfc4861#section-5.2

I guess you refer to this part of that section:
> The sender performs a longest prefix match against the Prefix List to
> determine whether the packet's destination is on- or off-link.

With LL addresses the destination is necessarily on-link, so why 
performing that check?

Second, a "fe80::/64" is the same on each interface, so performing that 
check can not distinguish between interfaces.  It could as well be a 
"fe80::/10."

Or maybe you referred to another paragraph that I miss.

Yours,

Alex

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