I tried SLAAC instead of DHCPv6 but still same result. I have ipv6 addresses but no connection and status for the ipv6 is still connecting... I managed to access the tenet port of the tp-link, Part...

Model : TD-W9970 Hardware Version : Firmware Version : 0.9.1 0.2 v0076.0 Build 170919 Rel.61201n ISP : BT I have just bought a new TD-W9970 V2 specifically to get ipv6 native connections from my BT...