This topic

IPv6 on TP-Link Archer AX95 with BT Full Fibre

NJackooo — Thu, 03 Aug 2023 14:37:18 GMT

Hi, for the life of me I can't get IPv6 to work on my TP Link Archer, I've seen people have had success with the Deco models, I've tried the numerous settings.

I read BT has a weird implementation of IPv6? (they use a /56 prefix instead of standard /64, genius).

Anybody had success with this?

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

Crimliar — Thu, 03 Aug 2023 16:16:05 GMT

The /56 prefix is correct and works just fine here. I've previously use Hurricane Electric 6in4 Tunnelling IPv6 with a /48 prefix, so not everything is /64!

One thing to watch for is that by default BT only push IPv4 DNS server addresses to the router during WAN-DHCP. I can't recall if these provide IPv6 addresses over DNSv4 as I don't use the default DNS anyway.

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

licquorice — Thu, 03 Aug 2023 16:19:20 GMT

Yes, the IPv4 DNS provides IPv4 and IPv6 addresses.

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

NJackooo — Thu, 03 Aug 2023 16:24:09 GMT

I’m using AdGuard Home on a Raspberry Pi as primary DNS and Cloudflare as Secondary, also put in cloudflare as the v6 DNS during my endeavours.

I have a 6to4 tunnel option that says it connects but I have no ipv6 on tests. Stumphed

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

Crimliar — Thu, 03 Aug 2023 16:48:00 GMT

Thanks to having to explain to someone why I dislike Ad Guard Home, I'm currently running it on my Asus GT-AX6000 router and it's pointing at the Quad9 DoT servers. I much prefer running either "Diversion" on the router thanks to its better integration with the Asus Firmware, or Pi-Hole on an SBC because of it's interface.

One this that can be problematic (my favourite word) can be mixing and matching any kind of filtering DNS servers. Running a locally caching DNS and a remote DNS can give unexpected results and one may filter when the other doesn't and devices tend to use the quickest DNS server not the "primary" first, and on a first time seek AGH is almost always going to be slower (as would Pi-Hole or Diversion be). So you are probably using Cloudflare more than you'd think!

*Did you know that Cloudflare has malware filtering DNS on 1.0.0.2 and 1.1.1.2 and their associated IPv6 DNS too!

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

NJackooo — Thu, 03 Aug 2023 18:08:13 GMT

My understanding is that windows has those tendencies, Apple devices and others tend to obey. (Mostly)

This doesn’t give any insight into IPv6 however.

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

Crimliar — Thu, 03 Aug 2023 18:30:14 GMT

So what scope is your network achieving with IPv6. Is it working locally, and what settings are you recieving from the BT servers?

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

NJackooo — Thu, 03 Aug 2023 18:43:01 GMT

Local devices get their IPv6 addresses, ipv6 web tests shows I can reach IPv6 sites but do not have an IPv6 address assigned.

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

licquorice — Thu, 03 Aug 2023 18:51:56 GMT

Where are you looking for an IPv6 address? Your WAN won't have one.

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

Crimliar — Thu, 03 Aug 2023 20:51:12 GMT

Here, my router is also acting as the DNS server, and it does have it's own IPv6 address which is different from the WAN gateway which is specifically "local"

On the Asus though getting the settings for BT is as simple as selecting the "native" connection type, and everything else gets filled in for you when you apply.

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

Crimliar — Thu, 03 Aug 2023 21:03:28 GMT

It can be very useful on the pi to edit /etc/dhcpcd.conf and uncomment "slaac hwaddr" as this will generate a fixed link-local address based on the MAC address of the Pi.

As for my settings in AGH, the only major change was to remove the suggested DNS servers and add "tls://dns.quad9.net" which gives me the base Quad9 IPv4 and IPv6 DNS servers.

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

NJackooo — Mon, 07 Aug 2023 18:47:47 GMT

Why wouldn't it have a IPv6 WAN IP? I'm sure it did when using BT's Smart Hub 2

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

licquorice — Mon, 07 Aug 2023 18:51:52 GMT

It doesn't need one, IPv6 is different to IPv4. All your devices will have a public IPv6 address.

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

Crimliar — Mon, 07 Aug 2023 19:16:21 GMT

So when you are using IPv4 everything gets sent to the router that sits at the WAN IP address, and then the router has to sort out it out and send it off to the devices on the LAN.

On IPv6 your router has it's own IPv6 address, as does everything behind the router have a directly addressable IPv6 address. So the closest you get is the IPv6 prefix which is the common part of the IPv6 addresses that all your devices share. If you pull up the network connection details, you'll still see an IPv6 "default gateway", but it's a LAN facing "local" (fe80::) address.

*Individual devices can have multiple IPv6 addresses. They'll often have a gobal address assigned by the router, a global address created using their MAC address as a base, and local address versions based on those two, so four is not uncommon. A couple of things running on one of my Raspberry Pi's do not only use port numbers but have their own IPv6 addresses too! The router has to do an awful lot more work than it used to!

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

NJackooo — Mon, 07 Aug 2023 20:00:27 GMT

I think I've got it working then via 6to4 Tunnel, devices have a 2002: address from the tunnel and also an fe80 address.

But then this still happens?

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

Crimliar — Mon, 07 Aug 2023 20:12:23 GMT

I'd kinda glossed over this but: You shouldn't be using 6to4 tunnel, on BT the IPv6 protocol should be "Native" and with a /56 prefix. On most routers, you won't even need to identify the/56 prefix!

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

NJackooo — Mon, 07 Aug 2023 20:18:15 GMT

It doesn't seem to want to save with these settings.

just says operation failed 😞 I've read others have had problems due to the /56 prefix, or rather TP-Links reluctancy to support it 🙄

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

licquorice — Mon, 07 Aug 2023 20:23:15 GMT

Try DHCPv6 or failing that Auto for Get IPv6 Address

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

NJackooo — Mon, 07 Aug 2023 20:26:05 GMT

It just gives me constant operation failed for anything under the PPPoE setting

Re: IPv6 on TP-Link Archer AX95 with BT Full Fibre

licquorice — Mon, 07 Aug 2023 20:30:18 GMT

What options do you get if you untick 'Share the same PPPoE session with IPv4'

The IPv6 settings are not related to PPPoE, its a different setting.