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Comment by DANmode

5 days ago

Conversely, their mobile network is the only 100% – or near 100% – IPv6.

Yes. For a while now. Actually to my detriment because TM hotspot users are usually IPv6 only. Which is a real issue for me. When I'm on a hotspot, my customers are unreachable to me. I can't VPN into them because 5 of 6 wireline ISP here are IPv4 only.

  • Are you trying to VPN directly to IP addresses instead of DNS names? Or using a custom DNS server? You should still have connectivity to IPv4 hosts, it's just that you need to translate the IPv4 addresses into their corresponding NAT64 IPv6 address (which is usually done for you by the T-Mobile DNS server)

    • I'm changing my response. After getting my hotspot to give me IPv6 only, I tried to duplicate what you expected to see. And to my surprise, I did.

      When I queried DNS for IPv4-only sites, I got IPv4 and IPv6 addresses. As recently as last month, I would get an empty result for those same queries (no IPs at all).

      After 2 years of off/on attempts, T-Mobile IPv6 is (for the first time) working for me as you describe.

      ------------------------------------------------------------

      > Are you trying to VPN directly to IP addresses instead of DNS names?

      DNS resolved hostnames

      > it's just that you need to translate the IPv4 addresses into their corresponding NAT64 IPv6 address (which is usually done for you by the T-Mobile DNS server)

      [ed:Below is from memory, based on last month's results. It's from memory because when I 1st tested today, my hotspot gave me IPv4 (a thing it does ~30% of the time)]

      TMobile's DNS servers give me an empty response to IPv4-only hostnames. When I'm in IPv6 only, there are a lot of sites I can't reach.

      The response is appreciated.