Lost IPv6

I have had IPv6 for several years. BT just persuaded me to transfer to EE and IPv6 has disappeared. The new EE router says it's enabled but it's not working. I can't work out where the problem is. I guess I'll have to brace myself for a long phone call to EE technical support, but in the mean time does anyone here have any ideas about what the problem might be?

Try a factory reset of the router.

Also you could see what ASN you are on using this: https://tools.iplocation.net/ip-to-asn
I'm guessing EE has been fully merged onto BT's ASN, but it might be useful to check.

Thanks. I've done a factory reset to no effect. I'm resigning myself to calling them.

ASN : 2856
Organization : BT-UK-AS BTnet UK Regional network, GB

In reply to a post by Oliver341:

I'm guessing EE has been fully merged onto BT's ASN, but it might be useful to check.

BT Broadband / EE broadband should have been a while ago as they’ve been trying to remove the BT brand for consumers and provide more features from the EE brand.

EE mobile can be different, you don’t generally get a routable IPv4, as you get IPv6 and some clever networking that delivers IPv4 content to your device over v6.

The ASN for the IPv4 gateway my EE mobile is using shows as:

ASN: 2856
Organization: BT-UK-AS BTnet UK Regional network, GB

After much faffing, IPv6 magically appeared while I was on the phone to EE tech support. They denied actually doing anything, but I'll never know.

In reply to a post by jchamier:

EE mobile can be different, you don’t generally get a routable IPv4, as you get IPv6 and some clever networking that delivers IPv4 content to your device over v6.

I think Sky are doing similar. Kind of wanted to see it in action since I only have a need for unique IPv6, but it's seemingly only for newer routers.

What Sky are doing and what EE Mobile do are different.

Sky are doing MAP-T. This involves cooperation with your router: your router is assigned an IP address and a range of ports (1/8th of the range 0..65535) and it only NATs to that range. The packets are then rewritten to IPv6, and get converted back to IPv4 statelessly. All the NAT session state is held in your own router.

Mobile networks use 464XLAT. IPv4 source/destination are rewritten to IPv6, but the stateful translation back to IPv4 is done in a CGNAT device on the provider side.

In reply to a post by candlerb:

What Sky are doing and what EE Mobile do are different.

Sure, I meant similar in that they are leaning more on IPv6 in an effort to minimise IPv4 usage, which I think is a good thing.

In reply to a post by candlerb:

Sky are doing MAP-T.

Out of interest what happens if you don't use their router that supports this?

In reply to a post by PCJM40:

Out of interest what happens if you don't use their router that supports this?

The older Sky routers don't support this, so the network has a fallback.

This might be of interest:
https://www.ukfcf.org.uk/isp-sky-broadband-uk-deploy...

It falls back to a dedicated IPv4 address if you use your own router, the router detects that you are using an application that needs inbound routing, or you explicitly opt out of address sharing.

Well, I did have IPv6 for a few hours and then it disappeared again. EE aren't being very helpful about fixing it.