On 2010-02-17 at 22:44 +0000, Colm Buckley wrote: > So, I've been learning all about IPv6; lots of good stuff. Got myself a > SixXS tunnel, set up a routable subnet, set up radvd, configured DNS... > everything works great. > > Slight strangeness with the OS X laptops, though - they seem to neither > consistently select IPv6 over IPv4 when both are available, nor have a knob > to tweak to change the behaviour. It seems to be pretty random whether an > IPv4 or IPv6 address is returned by the native resolver routines. > > Anyone know whether there's a button to press to make it prefer IPv6 over > IPv4 when both are available?
This came up on the ipv6-ops list recently, which is why I know of this, not from first-hand experience. Ron Broersma notes that: } The confusing behavior you're seeing in OSX 10.6 is most likely the } mDNSResponder issue reported earlier by Bernhard. Apple } switched to mDNSResponder for unicast DNS resolution in 10.6, but that } broke IPv6 address selection because mDNSResponder takes } whatever is the first response (A or AAAA) and drops (rejects) all other } answers. So, depending on how you ask, and depending on } what address comes back first, there is no way for the rest of the } system or applications to see all the responses and make } appropriate address choices. This seriously impacts IPv6 interactions, } because it no longer deterministically prefers AAAA over A, } but rather uses only the response that arrives first. } } A detailed bug report (#733104) was filed last October. } } As always, multiple bug reports to Apple will get their attention. Regards, -Phil _______________________________________________ Tech mailing list [email protected] http://lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
