DHCPv6 still feared and hated at Apple?, was Re: Mac OSX 10.7from Sabrina

[Mark Kamichoff]

On Thu, Aug 18, 2011 at 11:22:31PM +0300, Sabrina Friedman wrote:
> Sorry to come late to this thread, but I did some testing with a
> freshly-installed copy of Lion (clean install, not upgrade).  DHCPv6
> does work as expected as you mention.  I also noticed that
> privacy/temporary SLAAC addresses are enabled by default.  Anyone else
> seeing that?

Indeed, and I can see this causing problems in certain environments,
such as enterprise networks.  Doing the following:

% sudo sysctl -w net.inet6.ip6.use_tempaddr=0 

... disables it.  Originally this didn't work for me running 10.7.0, but
it seems to work correctly on 10.7.1.  The temporary addresses are still
there after I set the sysctl, but they're not used for outgoing
connections anymore.  I suspect they'll be purged after the lifetimes
expire.  Although, I'm not sure how to set this on boot, since
/etc/sysctl.conf doesn't exist on OS X.  A hacky rc.local script would
probably work, but there's got to be a better way.

- Mark

-- 
Mark Kamichoff
prox at prolixium.com
http://www.prolixium.com/
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