Re: Updated IID length text

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 20 January 2017 04:42 UTC

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Subject: Re: Updated IID length text
To: Suresh Krishnan <suresh.krishnan@ericsson.com>
References: <148406593094.22166.2894840062954191477.idtracker@ietfa.amsl.com> <m2d1frhjfn.wl-randy@psg.com> <18e6e13c-e605-48ff-4906-2d5531624d64@gmail.com> <CAKD1Yr1cvZ8Y3+bHeML=Xwqr+YgDspZGnZi=jqQj4qe2kMc4zw@mail.gmail.com> <m2lguffnco.wl-randy@psg.com> <CAKD1Yr1TrTiPRdyutobmb_77XJ7guNzLrg=H_p7qi4BfQ8V=GA@mail.gmail.com> <m2d1frfm6m.wl-randy@psg.com> <CAKD1Yr2Njjd8_Mr+6TRFF6C5pdcX4yFgpFVyEkykDuytu2B8mg@mail.gmail.com> <2A5073777007277764473D78@PSB> <4596c3d4-a337-f08e-7909-f14270b7085f@gmail.com> <CAN-Dau06R3iYRpYLADhvHox4C9qdsJCuxFsJapRhOQcWT4qk_g@mail.gmail.com> <CAO42Z2weZcoHiBzN94QAQ9WGhWR16PmMMFNg=5YLmr_dhPjjpA@mail.gmail.com> <fcc7f136-b5da-527e-b495-5a2d7f7a3ce8@gmail.com> <55bb8bdbfbf4439da0aa702e5bc03e2c@XCH15-06-11.nw.nos.boeing.com> <bb79ce41f2cc465dab0a7f26466be26f@XCH15-06-11.nw.nos.boeing.com> <ed9fe2df-0dce-0ddc-bdee-561217d089bb@gmail.com> <e8b4d426-55b4-bd2e-ea4f-f8e56e831d44@gmail.com> <453DEC8C-F825-40E3-8F7F-EFDEF372C4FD@ericsson.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Fri, 20 Jan 2017 17:42:52 +1300
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On 20/01/2017 17:08, Suresh Krishnan wrote:
> Hi Brian,
> 
>> However, correct use of Stateless Address Autoconfiguration
>>   (SLAAC)[RFC4862] requires all interfaces on a link to use the same length
>>   of Interface ID.
> 
> I don’t think this is true. SLAAC only requires that the prefix length and IID length add up to 128. So, we can advertise different prefixes (with different lengths) on a link to support different IID lengths. We never did because both the prefix length and the IID length have been 64 bit long in the most prevalent cases.

Technically, yes, but I doubt if much current code would work that way.
I agree that the sentence needs that addition.

Thanks
    Brian