On Saturday, September 26, 2015, David Hubbard < dhubb...@dino.hostasaurus.com> wrote:
> Hey all, as we've slowly deployed IPv6 to our end users, it has begun to > cause some issues for those on Mac's specifically. Apple apparently has > an algorithm at some point in the network stack to decide whether IPv4 > or IPv6 is, perhaps, 'better' or 'faster' at any given point in time > during an ongoing session. This allows a computer talking to a dual > stack remote website to flip flop between v4 and v6 as activity is > conducted. > > Websites that require some type of authentication that is handled via > session cookies have been booting our users out randomly with "your ip > address has changed" type message. This occurs when their Mac decides > to switch between protocols because the site views it as a session > hijacking attempt when Joe User with session ID xyz switches from > 192.0.2.10 to 2001:db8::1:1:a or vice versa. > > Has anyone run into this? Our users on other platforms don't seem to > have this issue; linux and MS desktops seem to just use v6 if it's > available and v4 if not. > > Thanks, > > David > Info about Apple and their unique IPv6 selection process https://www.ietf.org/mail-archive/web/v6ops/current/msg22455.html