On 9 Jun 2011, at 10:22, Phil Mayers wrote:
> Actually, scratch that. The traffic we're still getting seems to be Google/Youtube. There's no AAAA now, so obviously some clients have hung onto the cached record for rather longer than they should.
MacOS X caching behaviour turned out to be very interesting. I posted something about that yesterday, but it seems to be deeper than that.
It's as if OS X will just ignore AAAA responses if they don't come back quickly enough, and thus you 'lock' into IPv4 if the A response arrives quickly. I need to rig up some tests, but if anyone has looked in detail at that already and has the info, it would be appreciated.
Tim
|