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
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From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Wed, 8 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