Something like this should work.
I have same setup on 7.1.1 as on 6.x and it is working.Does your ISP provide IPv6? If it does ask them how you can get IPv6 on your devices.
Thank you for right direction. MTU for IPv6 worked.What is you PPPoE interface Actual MTU?
Anyway, take a look on this topic too: viewtopic.php?f=2&t=169757&p=832247#p831447
Leds work on boot. But after router come in working state they switch off.Upgrade from 6.40 last rc to 6.41.3 my 2011UiAS-2HnD all leds on active interfaces are off, Except led on eth10 is on witch is POE Out and is active. Is this normal or something wrong with this.