Re: [Autoconf] RFC 5889

Erik Nordmark <erik.nordmark@oracle.com> Thu, 29 July 2010 12:45 UTC

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Date: Thu, 29 Jul 2010 05:44:05 -0700
From: Erik Nordmark <erik.nordmark@oracle.com>
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To: "Dearlove, Christopher (UK)" <Chris.Dearlove@baesystems.com>
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Subject: Re: [Autoconf] RFC 5889
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On 07/29/10 05:39 AM, Dearlove, Christopher (UK) wrote:
>> NEW:
>>   o  In general there is no mechanism to ensure that IPv6 link-local
>>      addresses are unique across multiple links, however link-local
>>      addresses using an IID that is of the modified EUI-64 form is
>>      globally unique. Thus if link-local addresses are used to reliably
>>      identify routers then they must be of the modified EUI-64 form.
>
> That's a change in substance from something being discouraged (see the
> following OLD quote) to telling you how to do that very something.

Your observation is correct.

However, the recommendation of the draft doesn't change as a result of 
this. The arguments leading up to the recommendation were flawed IMHO, 
but the recommendation is fine.

>> OLD:
>>    Therefore, autoconfiguration solutions should be encouraged to
>>    primarily focus on configuring IP addresses that are not IPv6 link-
>>    local.
>>
>> NEW:
>>    Therefore, an autoconfiguration solution which provides a mechanism
> for
>>    assigning addresses with a wider scope than IPv6 link-local alone
> will
>>    be more generally useful than one that does not.
>
> That's more than an AUTH-48 error correction, it's a substantial change
> in the document's intent. Or so it appears to me.

FWIW I didn't suggest that change; it might have been Jari.

    Erik