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Re: appropriate length of fe80:: prefix and new IP-over-foo drafts

Alexandre Petrescu <alexandre.petrescu@gmail.com> Thu, 31 January 2019 10:25 UTC

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Subject: Re: appropriate length of fe80:: prefix and new IP-over-foo drafts
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, Mark Smith <markzzzsmith@gmail.com>
Cc: IPv6 IPv6 List <ipv6@ietf.org>, 神明達哉 <jinmei@wide.ad.jp>
References: <6d9657d0-803c-fcb2-ddb9-13f707bdfd47@gmail.com> <bb47b4e1-b10a-6991-98e3-4cefee0b0be9@gmail.com> <669451bbcccf406eb812c518c3ab9f72@ustx2ex-dag1mb5.msg.corp.akamai.com> <CAKQ4NaXGmuuqE=W=fepZDEn8NVJGwtQtdRxxC7j6PePNzy5WGA@mail.gmail.com> <5f27ed42c17a463898c43e94422499a2@ustx2ex-dag1mb5.msg.corp.akamai.com> <CAKQ4NaXS0JjbainT+7AiEb3FudqNiVKc_YXQ1y0JrLSSnzFAPw@mail.gmail.com> <27f3c3266f2e4a7f9ed773e986d41275@ustx2ex-dag1mb5.msg.corp.akamai.com> <38ef7dced8e34455b1059ce3ca8afeb1@ustx2ex-dag1mb5.msg.corp.akamai.com> <0af59661-ed8b-cd25-1125-468604edee53@gmail.com> <1df7d774-fe97-2feb-444a-94992cb89581@gmail.com> <CAJE_bqfVkFkvxVto67VGhjDK61ob6wxZXCRObtmwpr3GSyenfw@mail.gmail.com> <2def076d-b6bf-d84f-152b-d1d9277e9e73@gmail.com> <CAKQ4NaUW5-VY=TMjh0Ap01KTg4=An8=EXH_ej40nW=GM1kUL4w@mail.gmail.com> <c54b9702-1c6f-e5ae-971d-7d3ef443d994@gmail.com> <CAO42Z2wPAF6YCwsb+f0BXMEOKdFSiiFRNop=ChvKFPW32UepBA@mail.gmail.com> <e2a1a5c4-832f-744e-db69-2100c32fb59e@gmail.com>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Thu, 31 Jan 2019 11:24:55 +0100
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Le 30/01/2019 à 23:14, Brian E Carpenter a écrit :
> Section 5.3 "Creation of Link-Local Addresses" of RFC4862 refers to
> an interface identifier of N bits and an fe80::0 prefix "of
> appropriate length", which according to the addressing architecture
> is 128-N. But N is undefined by RFC4862 and cannot be derived from an
> RA because all this happens as soon as the interface is enabled.
> Therefore N must be predefined.
> 
> As pioneered by RFC2464**, all ipv6-over-foo documents must therefore
> specify N for their link type. So far, everybody has specified 64, as
> far as I know. Is there a reason to do otherwise for the two drafts
> mentioned below?

One of the two drafts involves a Network ID of length 24.

The question is why not use 24 for InterfaceID?  Just because Ethernet 
had it that way?

Alex

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