TP Link routers and IPv6

[Nepomucene]

I suspect the issue is a LAN one, not WAN.

But I'm out of my depth.

I suspect LAN / General Setup / LAN1 IPV6 Setup, but no idea of what this should be set as...

I have tried enabling and disabling the DHCPv6, with and without random/auto IPV6 allocation... But always the same test results

[WSH]

That doesn't look like the page I used to get using the Draytek native but it might be just the ping detect that's changed.  In fact, that page looks a lot like the one I use now, (as a DHCP client of the SH2).  If you are going through the SH2 try it as DHCPv6 client and set the SH2 IPv6 config as stateless that way it should just be passing an RA to the Draytek.  (Sorry, RA=Router Advertisement).

[WSH]

Ah, you need to set the O-bit.

[Nepomucene]

The O-bit ios now ticked.

Tried both PPP & DHCPV6, but still the same results:

PS: Not using the phone anyway, so no impact from DV => Using the Draytrek as modem.

FailOver from USB 4G modem (deactivated for the tests).

IPv4 works perfect

IPv6 seems to be working on WAN, but failing on LAN. Sadly my IPv6 knowledge is poor.
Should my laptop get a fd46:[...] IPv6 address or this is already a symptom of the problem?

[WSH]

No, it should be getting a global address starting with "2" (or possibly "3").  FD is a ULA (unique local address), the equivalent of an IPv4  private address.  (Similar to the local FE address, that it uses within your LAN).

You're not trying to set the address manually are you?  It's a stange one.  I'll ponder it for a while and let you know if I come up with anything.

[Nepomucene]

That was my thought.

The Dashboard mentions 2 IPv6 addresses for the WAN connection:
a Global one: 2A00:[...]:15C5/128
a Link one: FE80:[...]:15C5/128

But my laptop gets a local address and a Temp in FD46:[...]

On the WAN side: Removed the Ping detect for now but toggling to test regularly, no effect. Staying on PPP.
Right now, RIpng is not enabled. OK?

On the LAN side: IPv6 is obv enabled.
Will BT serve me a IPV6 DNS or should I use 1.1.1.1's IPv6?
Should the DHCPv6 Server be enabled?
If yes, what settings?

Then should I touch the advanced settings?


Should I touch the RA configuration?

Sorry for all the questions 😄

[licquorice]

BT do not have IPv6 DNS servers, they use IPv4 servers to serve IPv6 addresses.

[WSH]

Yours are Cloudflare, I think, but pre DV I used to use Cisco’s OpenDNS and Google’s, on

2620:119:53::53 and 2001:4860:4860::8844 resp.

You could give them a try.

It’s where it’s getting the ULA from that that I don’t get.

[Nepomucene]

I'll try but I tend to trust Cloudflare/1.1.1.1 more than Google/8.8.8.8...

[Nepomucene]

Sadly exact same result with BT, Cloudflare or Cisco's...