Mac OS X 10.7, still no DHCPv6

Ray Soucy rps at maine.edu
Sun Feb 27 18:26:26 CST 2011


(I'm just waiting for Apple's lawyers to try an get names out of me...)

But yes, it does appear that Apple is addressing the issue:

----8<----
cat /etc/ip6addrctl.conf
# default policy table based on RFC 3484.
# usage: ip6addrctl install path_to_this_file
#
# $FreeBSD$
#
#Format:
#Prefix       Precedence Label
::1/128               50     0
::/0                  40     1
2002::/16             30     2
::/96                 20     3
::ffff:0:0/96         10     4
----8<----

On Sun, Feb 27, 2011 at 6:41 PM, Tore Anderson
<tore.anderson at redpill-linpro.com> wrote:
> * Owen DeLong
>
>> On Feb 27, 2011, at 4:21 AM, Randy Bush wrote:
>>
>>> NOC: are you running a macintosh?
>>> User: yes, how did you guess?
>>> NOC: because it is broken.  get vista.
>>
>> While I'm as big a fan of IPv6 as anybody, I think in a comparison of
>> relative brokenness, Mac comes out quite favorably compared to
>> Vista in spite of their DHCPv6 deficiencies.
>
> Absolutely not. Mac OS X does not do proper source address selection
> according to RFC 3484. That makes it do things like preferring the use
> of link-local IPv6 addresses when connecting to global dual-stacked
> destinations, which of course won't work - as a result a 75 second long
> timeout is incurred for every single outgoing TCP connection. Versions
> earlier than 10.6.5, still in use by a considerable amount of users,
> will also prefer the use of 6to4 to IPv4, again something which is
> causing lots of brokenness. (Windows ICS is responsible for causing lots
> of OS X hosts to have 6to4 addresses in the first place, though.)
>
> OS X also has a bug that will make it interpret a router lifetime of 0
> in a RA as infinite, causing more troubles when found behind IPv6 CE
> routers using ULAs in compliance with I-D.ietf-v6ops-ipv6-cpe-router,
> one example of which is the AVM FritzBox as far as I understand.
>
> See also:
>
> http://getipv6.info/index.php/Customer_problems_that_could_occur
> http://fud.no/ipv6/snapshot-20101221/gnuplot/noosx-t10-historic.png
>
> My guess is that about 70-80% of the users calling Randy and others to
> report problems on «World IPv6 Day» will be running Mac OS X.
>
> Ray: Do you know if RFC 3484 has been implemented in OS X 10.7?
>
> --
> Tore Anderson
> Redpill Linpro AS - http://www.redpill-linpro.com/
> Tel: +47 21 54 41 27
>



-- 
Ray Soucy

Epic Communications Specialist

Phone: +1 (207) 561-3526

Networkmaine, a Unit of the University of Maine System
http://www.networkmaine.net/




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