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[Weaver]

Given that AA have been doing IPv6 for something like 20 years, or thereabouts, and that they are always championing it, I’m trying to understand why there’s no IPv6 (still) available with their 4G data SIMs. I always just put it down to their AQL and Three, AA’s carriers, being useless. But now I think about it, I don’t understand how it’s possible not to have IPv6 working. AA uses PPP, and so everything that goes across the link is just some random PPP PDU no? Or is it something to do with PPP authentication/login? Could AQL or Three be inspecting the content of PPP PDUs and objecting to anything that is IPv6?.

Crazy note: Since AA can send data from their Firebricks encapsulated in PPP LCP PDUs marked with a special LCP ‘this is data’ type code, maybe that obfuscation would make IPv6 work? Mind you, it would be no good for me, as I’m not using a Firebrick at my end in this case, rather I’m using an iPad.

[meritez]

AQL offer a Ripe IPv6 traning course:
https://portal.aql.com/ripeipv6/

I'd blame Three UK with their excessive use of CGNAT.

[Alex Atkin UK]

I'd blame Three UK with their excessive use of CGNAT.

They don't use CG-NAT on their 3internet home broadband APN, AFAIK the only provider who doesn't.

That APN does seem more prone to congestion however than the CG-NAT three.co.uk one.

However, AAISP L2TP runs absolutely fine over both, including IPv6.

I don't have my 5G router in Bridge Mode even, as I like being able to connect to its WiFi to test port forwarding and my VPN are working.  Plus if my pfSense box messes up, I have an easy way to immediately get back online. (I only have PAYG on my phone given I rarely use its data connection and calls are cheaper over VoIP)

[Weaver]

But do you see my point? How is it even possible to refuse to handle IPv6? Given that PPP is just PPP. (Apart from the protocol-specific features of PPP, the NCPs and maybe the login process.)

[Alex Atkin UK]

Its more fundamental than that as is it actually PPP or are they using L2TP (which is more or less PPP)?  I don't understand how plain PPP could work over a mobile network, unless AAISP have their own APN?  Which would make no sense that its less functional than using L2TP over Threes own network.

[Weaver]

The APN default works, or you specify m2m.aql.net

[Alex Atkin UK]

Then I'd think its actually using L2TP, which as I understand it is PPP to a specific IP address, rather than normal PPP that just expects a response from a blind broadcast over the network.  As IPv6 works fine over L2TP over a normal Three service, it is indeed odd.