Airport Express is setting the IPv6 Tunnel MTU to 1280 in all cases and it's not configurable, as far as I'm aware.
Andras On Fri, Jan 23, 2015 at 6:56 AM, Mikael Abrahamsson <[email protected]> wrote: > On Fri, 23 Jan 2015, Lorenzo Colitti wrote: > > Thanks for reporting this. What was the effect? Connections just getting >> stuck? Was there fallback to IPv4? >> > > I would get all the CSS, comments etc, the player would start to try to > load the video stream, but there would be no video loaded at all (ie the > progress bar never moved). > > Personally I don't understand why everyone behind a manually-configured >> tunnel doesn't set the MTU in the RA to the MTU of the tunnel... but >> that's >> not an excuse for things not working. >> > > I did that before, but I can't do it in my Airport Express. I have been > considering changing my IPv6 tunneling to another device. > > However, I have no clue why my OSX box thought it couldn't send 1350 byte > sized UDP packets to the Internet. Could Google have sent me PTB=1280 from > this host, so my OSX box thinks it can't send them unfragmented? > > Anyone know how I can check in OSX for what destinations it has received > PTB packets and what the PMTU it think it has for these destionations? > > > -- > Mikael Abrahamsson email: [email protected] >
