> On Oct 1, 2015, at 22:46 , Doug McIntyre <mer...@geeks.org> wrote: > > On Tue, Sep 29, 2015 at 09:23:59AM +0200, Mark Tinka wrote: >> On 26/Sep/15 16:34, David Hubbard wrote: >>> 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. >> >> I have been tracking down an issue for months where SSH'ing to some >> devices (which picks IPv6 by default) from my Mac while in the office >> drops the connection, forcing me to reconnect. It's random; sometimes it >> happens a lot, sometimes, rarely, other times not at all. > > I suspect this is OSX implementing IPv6 Privacy Extensions. Where OSX > generates a new random IPv6 address, applies it to the interface, and then > drops the old IPv6 addresses as they stale out. Sessions in use or not. > > sudo sysctl -w net.inet6.ip6.use_tempaddr=0 > > sudo sh -c 'echo net.inet6.ip6.use_tempaddr=0 >> /etc/sysctl.conf'
I doubt it given the variable frequency he describes. If it were OSX timing out addresses, he’d see a session drop every day or two rather than frequently sometimes. Owen