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    Does the upstream router support Prefix Delegation? Because if it doesn’t, this never going to work.
    – Daniel B
    Commented Oct 16, 2016 at 15:45
  • @DanielB I am not sure but the IPv6 connectivity worked with the router of my former flatmate (on the place of my current TP-Link router).
    – Melebius
    Commented Oct 16, 2016 at 15:51
  • 2
    Hm. Are you sure the previous router was actually a router and not, say, a switch? Perhaps you need to explicitly allow PD for specific devices in the upstream router. What make and model is the upstream router?
    – Daniel B
    Commented Oct 16, 2016 at 16:14
  • @DanielB Well, it turns out that it was probably configured as a switch. I have just found my end devices in the list of DHCP leases of the upstream router (as expired). The upstream router seems to be Comtrend VR-3026e (I do not have physical access to it at the moment).
    – Melebius
    Commented Oct 16, 2016 at 16:28
  • I'll always go with putting OpenWrt on a home router, but in this case, your immediate problem is that the upstream Comtrend whatever router is misbehaving. That's what you need to look at.
    – Michael Hampton
    Commented Oct 16, 2016 at 16:50