I solved the problem with TL-MR6400(EU)_V2_170912

http://www.tp-link.es/download/TL-MR6400.html#Firmware

Fecha de Publicación: 2017-09-12 Idioma: English Tamaño de Archivo: 21.29 MB
Modifications and Bug Fixes Bug Fixed:
1. Fixed the bug that slaac cannot connect to IPv6 network in EWAN mode.
2. Fixed the bug that IPSec VPN data cannot be passed.
3. Fixed the bug that device may fail to dial up if the ISP has more than one network type.
Notes For TL-MR6400(EU)_V2.0.