Re: IID length text

Behcet Sarikaya <sarikaya2012@gmail.com> Mon, 16 January 2017 21:22 UTC

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From: Behcet Sarikaya <sarikaya2012@gmail.com>
Date: Mon, 16 Jan 2017 15:22:09 -0600
Message-ID: <CAC8QAcebfUyq49HoiG3-dO-VjHs0ztt6J6T4c31foRuSOjzZxQ@mail.gmail.com>
Subject: Re: IID length text
To: Fernando Gont <fgont@si6networks.com>
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Cc: Alexandre Petrescu <alexandru.petrescu@gmail.com>, 6man <ipv6@ietf.org>
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On Mon, Jan 16, 2017 at 2:46 PM, Fernando Gont <fgont@si6networks.com> wrote:
> On 01/16/2017 05:42 PM, Behcet Sarikaya wrote:
>> On Mon, Jan 16, 2017 at 2:27 PM, Alexandre Petrescu
>> <alexandru.petrescu@gmail.com> wrote:
>>> Le 14/01/2017 à 20:49, Brian E Carpenter a écrit :
>>>>
>>>> A modest suggestion:
>>>>
>>>> OLD
>>>>    For all unicast addresses, except those that start with the binary
>>>>    value 000, Interface IDs are required to be 64 bits long.  Background
>>>>    on the 64 bit boundary in IPv6 addresses can be found in [RFC7421].
>>>>
>>>> NEW
>>>>    IPv6 routing is based on prefixes of any valid length up to 128
>>>> [BCP198].
>>>>    For example, [RFC6164] standardises 127 bit  prefixes on point-to-point
>>>>    links. However, consistent use of Stateless Address Autoconfiguration
>>>>    (SLAAC)[RFC4862] requires that all interfaces on a link use the same
>>>> length
>>>>    of Interface ID. In practice, this means that to guarantee
>>>> interoperability
>>>>    of SLAAC, a fixed length of Interface ID is necessary. For all
>>>> currently
>>>>    allocated unicast addresses, except those that start with the binary
>>>>    value 000, that length is 64 bits. Note that this value is an arbitrary
>>>>    choice and might be changed for some future allocation of unicast
>>>> address
>>>>    space. Background on the 64 bit boundary in IPv6 addresses can be found
>>>>    in [RFC7421].
>>>
>>>
>>> I agree with the change suggestion.  The new text and references are enough
>>> motivation to clarify that that 64bit limit is an arbitrary choice and might
>>> change in the future.
>>>
>>
>> 3GPP assigns 64 bit prefixes to each UE.
>> Extended Unique Identifiers defined are EUI-48 and EUI-64.
>
> What does a layer-2 EUI have to do with a layer-3 address?

I don't know, you tell me :-)


>
> --
> Fernando Gont
> SI6 Networks
> e-mail: fgont@si6networks.com
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