IPv6 over LTE not working yet?

[zorinlynx]

Using HE network tools, my iPhone 6 shows that I have an IPv6 address on my AT&T LTE connection, but as you can see below, it doesn't seem to work when I visit an IPv6 test site in Safari.

When I turn on WiFi, I can access the site just fine through my Comcast IPv6-enabled connection.

Any idea what's going on and why the phone has an address but won't use it?

 

[Chambersaj]

Using HE network tools, my iPhone 6 shows that I have an IPv6 address on my AT&T LTE connection, but as you can see below, it doesn't seem to work when I visit an IPv6 test site in Safari.

When I turn on WiFi, I can access the site just fine through my Comcast IPv6-enabled connection.

Any idea what's going on and why the phone has an address but won't use it?

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I'm not sure AT&T is ready for global routing with those prefixes, yet. They may just be using them internally. A Whois on them says ARIN still owns them and they aren't assigned. A Whois on your Comcast IP by contrast shows that network is assigned to Comcast. So it's an AT&T issue. The interesting thing about get IPv6 addresses from AT&T is when you have WiFi calling enabled you are assigned the same address on LTE and your VPN tunnel. I'm guessing this is how the handoff between cellular and Wifi is accomplished.