I've been having a bit of trouble with my IPv6 tunnel routing through my Raspberry Pi, I've managed to work out what the problem was and added it to the instructions.
My Hurricane Electric Tunnel is set to 1480 (which should be the correct size for PPPoA "ADSL2+") so everything should be fine you would think (and it has been up until a few days ago)
My router rebooted (power cut) and as far as I understand it, my router negotiates it's MTU with my ISP and comes up with 1492 bytes. At this point my tunnel drops almost everything that tries to go through it.
So, to cut a long story short I've changed the MTU from 1480 to 1472 on both sides of the tunnel and everything is working fine now.
Added the following to the instructions.
# The MTU set on my router "negotiated via my ISP" is
# 1492. So 1492 - 20 = 1472.
# If your routers MTU is 1500, then you can just leave
# the following line out, as it will default to 1480.
mtu 1472
I was wondering if I should now advertise the new MTU via my DHCPv6 Setup? and update the documentation?
Any suggestions/advice appreciated.
Cheers,
Billy