On Mon, 26 Jan 2015, Ignatios Souvatzis wrote: >> when sent 1500 byte packets, and my airport extreme will send PTB=1280. > > to the inside only, or even to the outside for incoming packets? Inside only. It'll happily receive 1480 sized tunneled IPv6 packets, decapsulate and send out to the LAN. -- Mikael Abrahamsson email: swmike at swm.pp.se