On 29/06/2015 01:09, Pierre Pfister wrote:
> Hello,
>
>> Le 28 juin 2015 à 10:58, Gert Doering <g...@space.net> a écrit :
>>
>> Hi,
>>
>> On Sat, Jun 27, 2015 at 11:48:43PM +0200, Pierre Pfister wrote:
>>> Relaxing the « administrator » may be confusing, as Brian said.
>>> So I guess the MUST could become a SHOULD, which imply it requires
>>> implementers to fully understand the drawbacks
>>> of using non-64 prefix lengths. For instance, /127 could be automatically
>>> used (no need for administrator) if a link
>>> is auto-detected as point-to-point.
>>
>> A MUST is perfectly right here. You can't have implementation A decide
>> "let's use a /64 here" while implementation B goes for "/127"…
>
> You actually can have implementations with different prefix length.
> This is handled by the prefix assignment algorithm.
Yes, you need that ability in the protocol, but it won't work in practice
to pick an oddball like /80 unless all the host stacks on the link can
handle a shorter IID like 48 (whether it's a LAN or a pt2pt). RFC 7421.
> You may have multiple routers with multiple prefix lengths, but one single
> prefix is ultimately chosen and used by all routers connected to the link.
So will it work if one router on a pt2pt expects to use a /127 and the other
one can only support /64?
Brian
>
> - Pierre
>
>>
>> The sentence is also clearly allowing alternatives: if I tell my router
>> "hey, I want to use /127s on point-to-point links", this is "unless
>> configured
>> otherwise by an administrator", so the MUST is not getting in the way then.
>>
>> Gert Doering
>> -- NetMaster
>> --
>> have you enabled IPv6 on something today...?
>>
>> SpaceNet AG Vorstand: Sebastian v. Bomhard
>> Joseph-Dollinger-Bogen 14 Aufsichtsratsvors.: A. Grundner-Culemann
>> D-80807 Muenchen HRB: 136055 (AG Muenchen)
>> Tel: +49 (0)89/32356-444 USt-IdNr.: DE813185279
>>
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