SV: Windows 7 and SLAAC?

[Bøvre Jon Harald]

Copy/paste from this page:
http://ipv6.net/
(check section 'Latest Post')

You are right. Windows 7 (Server 2008 & Vista as well) by default randomizes ipv6 auto-configured address selection. This is in violation with section 4 of RFC 2464 that mandates that the network identifier part of the IPv6 address is derived from the 48-bit MAC address for Ethernet (and Wireless) interfaces.
It may be that Microsoft chose to do this for privacy reasons..

For most users this will not be much of a problem but for those running a server it will. There is however a solution:

netsh interface ipv6 set global randomizeidentifiers=disabled

This will switch the feature off and address selection will be based upon the EUI-64 identifier, derived from the interface’s built-in 48-bit IEEE 802 address.


jon


________________________________________
Fra: ipv6-ops-bounces+jon.harald.bovre=hafslund.no at lists.cluenet.de [ipv6-ops-bounces+jon.harald.bovre=hafslund.no at lists.cluenet.de] på vegne av Gert Doering [gert at space.net]
Sendt: 30. mars 2010 13:42
Til: Tore Anderson
Kopi: Gert Doering; ipv6-ops at lists.cluenet.de
Emne: Re: Windows 7 and SLAAC?

Hi,

On Tue, Mar 30, 2010 at 01:34:22PM +0200, Tore Anderson wrote:
> > Does one of you have a pointer for me what Windows 7 is using here?  Some
> > sort of "windows installation global identifier"?
>
> I believe this is due to Windows 7 is using privacy extensions with
> SLAAC by default (RFC 4941).

No, that's something else.  I see two (global) IPv6 addresses on the
link, one that keeps changing (privacy) and one that is static - but
neither is related in any way to the card's MAC address.

Gert Doering
        -- NetMaster
--
Total number of prefixes smaller than registry allocations:  150584

SpaceNet AG                        Vorstand: Sebastian v. Bomhard
Joseph-Dollinger-Bogen 14          Aufsichtsratsvors.: A. Grundner-Culemann
D-80807 Muenchen                   HRB: 136055 (AG Muenchen)
Tel: +49 (89) 32356-444            USt-IdNr.: DE813185279