@luizfernandowb 

Who's the ISP? You can share this info with us and let the support team investigate. Maybe other people have the same issue. 

See the firmware is the latest. Release note says IPv6 supported. Confirm the PPPoE info are correct? Do you contact your ISP and confirm any other configs should be made on the router to support the authentication? 

Any luck with the controller mode? There are more options for IPV6 settings on Controller mode. 

I checked the LAN on Controller mode, you could set up IPv6 DHCP. 

I'm having the same problem. Had no issues with IPv6 on my old router. This one seems to have some very odd settings relative to other router firmware.

Here is CenturyLink gigabit fiber IPv6 instructions: https://www.centurylink.com/home/help/internet/modems-and-routers/advanced-setup/enable-ipv6.html

The IPv6 settings for prefix, stateless, etc. don't seem to impact the ability to connect. I confirmed that my GPON access point is IPv6 enabled. If this isn't resolved, will have to go with Ubiquiti. This is a huge fail for TP-Link...

@luizfernandowb CenturyLink uses 6rd for IPv6 in their network. Looks like TL-ER605 doesn't support that protocol. I'm also a CenturyLink customer and would be happy if TP-Link add that to one of next firmware versions. I think it's not too hard because it already support 6to4 and 6rd is very similar.

TP-Link support - is there any plans to add 6rd support to TL-ER605?

Could try this, I got it working with PPPoE

https://www.zylmenianetworks.co.uk/HomeNet/uncategorized/zen-internet-ipv6-tp-link-r605/

  @luizfernandowb Tried that. Didn't work. I don't think CenturyLink support IPv6 with this configuration. As I said previously - they work with 6rd.

  @luizfernandowb 

Did you ever get ipv6 to work?  I have, like you, tried 100 times different ways to get ipv6 through this er605 with no luck.  Although plug 2 different wifi routers into cable modem and both work immediately

  @Dogbreath negative. Tried a lot of different strategies, but at the end of the day the ER605 just does not support the 6rd protocol.

I've submitted it as a request to tp-link, but as others have pointed out their after-sales service leaves a lot to be desired.

I tried Mikrotik, but it's just not something I have a ton of time to spend on to develop a stable deployment.

At this point, I'm still searching for a router that can support 6rd with similar features to the 605. I'll dump tp-link in a heartbeat when I find it.