This topic

ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

maguirejohnny — Wed, 30 Nov 2022 12:03:00 GMT

Hi, there are many threads on this topic, however thought I would post my experience separately rather than pick a random existing thread.

Finally got ipv6 correctly configured to work with setup of-

BT FTTP, Openreach modem, TP-Link Deco X60 router with 2 x satellites.

After several configurations this one has proven to work, having checked the usual ipv6 web browser validation sites such as test-ipv6.ocm; also my laptop and iphone 13 connetion-

Connection type: PPPoE

Sync IPv4 Account: On

Prefix Delegation: On

DNS Address: Auto

Assigned Type: DHCPv6

Hope this helps someone!

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

McGrath1982 — Fri, 28 Jul 2023 16:20:41 GMT

Sorry to jump on this post. But I’m looking at getting these for myself with FF900 and not using the Smart Hub etc. Are you still using them and have you had any issues since posting this. Thanks

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

maguirejohnny — Fri, 28 Jul 2023 16:44:49 GMT

Hi there, yes I’m still using them and have had zero problems with ipv6 setup since posting. I would certainly recommend them, depending on current price competitiveness.

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

McGrath1982 — Fri, 28 Jul 2023 18:58:43 GMT

Thanks for the reply back just ordered them now the 3 pack £220 on Amazon

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

markbebb — Fri, 11 Aug 2023 03:31:37 GMT

I am trying to set my deco x95 to use IPv6 but no matter what setting I use, it seems to drop the IPv6 address after a few seconds and the Wi-Fi drops at the same time. It’s the strangest thing

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

NJackooo — Fri, 11 Aug 2023 09:16:44 GMT

I had the same thing with my AX95, make sure PPPOE username is bthomehub@btbroadband.com

Also, I found I had to reboot mine to get it to actually stop glitching out, once the settings were correct.

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

NJackooo — Fri, 11 Aug 2023 09:17:14 GMT

@markbebb

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

markbebb — Fri, 11 Aug 2023 12:54:14 GMT

Thanks! I'll give it a go

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

beanybaby212 — Sun, 03 Aug 2025 16:05:34 GMT

Felt the need to jump on this thread if you are still active, I'm having similar problems to these here.

I have a pair of deco x20's

I have had an ISP router behind them for years now, changed to EE smart hub not that long ago with my deco's in router mode.

I wanted to remove the smart hub to prevent double NAT'ing myself and found more problems, I didn't even realise my IPv6 wasn't working with smart hub connected and my deco's in Dynamic IP mode. (Haven't tried them in AP mode yet but I will assume for now that it will probably work). I want to keep the deco's router features so AP mode won't help me.

I have them connected now in PPPoE mode with IPv6 disabled and they work perfect, enabling IPv6 causes similar symptoms to above as it just keeps dropping the Wifi every 5-20 seconds and is very unstable when it is connected.

The only method I can seem to have a working IPv6 connection is with the deco's removed and only using the smart hub then all is fine.

EDIT: solved i have tried the setting get address to non address and all working fine!

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

Crimliar — Mon, 04 Aug 2025 17:25:02 GMT

As soon as you "Double NAT", there is nowhere for the secondary router to get an IPv6 delegation from, when using the BT SH2. Because of this your secondary router cannot assign IPv6 addresses that are addressable from outside of it's own subnet. You might still get local IPv6 addresses, but nothing really usable.

*Even for most of us with third party routers, we get a /56 delegation, but because the routers only use the first subnet (equivalent) we only really see the equivalent of a /64 delegation with upper most byte being 00H. You need to be getting into the realms of OpenWRT or RouterOS to see more. But just think how many devices that would actually be!

**Sits back and waits for a pedant to come in and say "well actually...."!

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

WSH — Mon, 04 Aug 2025 18:17:40 GMT

Well actually, I'm running a Draytek through the SH2 and it works fine set up as a DHCPv6 client.

(Not sure if that's pedantic or not...ha ha ha).

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

Crimliar — Mon, 04 Aug 2025 19:47:51 GMT

The Draytek will run as an client with a global IPv6 address, but is it passing on, or generating global IPv6 addresses (primary or secondary IPv6 "subnet"?) for clients? If so then the SH2 is more capable than I was aware!

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

WSH — Mon, 04 Aug 2025 19:55:41 GMT

Yes, in fact my Windows 11 machines seem to have switched to using IPv6 as their primary address. I was investigating something the other day and it turned out IPv4 had turned off. Be interesting to know how that happened, as I didn't do it.

I’ll risk being even more pedantic and say that I’ve also found the IPv6 prefix to be very stable over the past two years. It doesn’t change for a routine reboot and the SH2 has to be off for a long time for it to get a new prefix. Crude as it might be, I reckon one solution would be to just copy it and put it into the Draytek or whatever manually and then updating it as necessary. It is capable of entering a manually set prefix. Be interesting to see if that would work sometime.

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

WSH — Mon, 04 Aug 2025 20:21:07 GMT

To expand a bit more on the previous for anyone interested…the SH2 has DHCPv6 enabled stateless, the Draytek, set as DHCPv6 Client, then picks up an address for itself from that and then uses it to generate the router advertisement for the rest of my network. Seems to work very well.

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

Crimliar — Mon, 04 Aug 2025 20:27:31 GMT

Not what I'd expect! Can probably put this down to cleverness on the part of Draytek (pass thru mode?), rather the BT router doing things above and beyond the call of duty! Interestingly, at least according to the IpFoo extension, most of my connections on the laptops here are currently IPv6.

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

WSH — Mon, 04 Aug 2025 20:34:53 GMT

Yes, that reminds me, there is a bridge to LAN1 setting on the Draytek. What's really nice is that there is also a tick box to make sure it still goes through the firewall as well.

Edit: Sorry, ambiguous there. "goes through" as in enable firewall.

Re: ipv6 setup with a 3rd party router connected to BT FTTP , solved for TP-Link Deco X60

WSH — Mon, 04 Aug 2025 20:48:38 GMT

This is a picture from Draytek's interface demo rather than my actual router but it's set up like: