On 02/02/2013 10:27, Ray Hunter wrote:
> I've read the draft.
>
> Quote: It should be noted that IIDs known or guessed to have been created
> according to RFC 4941 could be transformed back into MAC addresses,
> for example during fault diagnosis. For that reason, keeping the "u"
> and "g" bits in the IID has operational value. Therefore, the EUI-64
> to IPv6 IID transformation defined in RFC 4941 MUST be used for all
> cases where an IID is derived from a MAC address.
>
>
> Dumb question: I don't get this. 4941 is "privacy extensions for SLAAC"
AAARGH. s/4941/4291/
> and generates random IIDs with u=0.
> How can you "transform" a privacy extension for SLAAC IID back to a MAC
> address?
>
> IMHO The only combination that has operational value for the purpose of
> mapping IPv6 address to MAC today is:
> u==1 && g==0 && (concatenated with unicast IPv6/64 prefix[2000::/3] ||
> link local address [fe80::/10]) && SLAAC (RFC4862)
>
> We've never had this sort of reverse mapping in IPv4, and "sh arp" on
> the local router was generally considered good enough operationally
> speaking.
> I 'd presume "show ipv6 neighbor binding" would also suffice.
Maybe, but every little helps.
Brian
>
> Brian E Carpenter wrote:
>> Hi,
>>
>> We've put this together to address the general question of the
>> u/g bits in Interface IDs. Discussion is requested.
>>
>> Brian + Sheng
>>
>> -------- Original Message --------
>> Subject: I-D Action: draft-carpenter-6man-ug-00.txt
>> Date: Fri, 01 Feb 2013 00:10:13 -0800
>> From: internet-dra...@ietf.org
>> Reply-To: internet-dra...@ietf.org
>> To: i-d-annou...@ietf.org
>>
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories.
>>
>>
>> Title : The U and G bits in IPv6 Interface Identifiers
>> Author(s) : Brian Carpenter
>> Sheng Jiang
>> Filename : draft-carpenter-6man-ug-00.txt
>> Pages : 7
>> Date : 2013-02-01
>>
>> Abstract:
>> The IPv6 addressing architecture defines a method by which the
>> Universal and Group bits of an IEEE link-layer address are mapped
>> into an IPv6 unicast interface identifier. This document clarifies
>> the status of those bits for interface identifiers that are not
>> derived from an IEEE link-layer address.
>>
>>
>> The IETF datatracker status page for this draft is:
>> https://datatracker.ietf.org/doc/draft-carpenter-6man-ug
>>
>> There's also a htmlized version available at:
>> http://tools.ietf.org/html/draft-carpenter-6man-ug-00
>>
>>
>> Internet-Drafts are also available by anonymous FTP at:
>> ftp://ftp.ietf.org/internet-drafts/
>>
>> _______________________________________________
>> I-D-Announce mailing list
>> i-d-annou...@ietf.org
>> https://www.ietf.org/mailman/listinfo/i-d-announce
>> Internet-Draft directories: http://www.ietf.org/shadow.html
>> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>>
>>
>
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