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IPV6 +VPN

I've been trying to plug in my nextdns ipv6 address directly into my vpn's android app (not the private dns android settings, as this gets blocked by my work network and needs to be within the VPN to resolve). It connects fine and uses the ipv6 but when I log into my nextdns account it says that it's being used without a profile and doesn't use any of the blocklists.

If I link my ip to an Ipv4 address it works as intended, but as soon as I add the ipv6 address to my my Custom dns section in the VPN the blockers stop and the status of the device changes back to no profile. (Yes I have ipv6 enabled and working on in my vpn settings)

I can't use DoT on mobile as the ipv6 message requests, is it not possible to use ipv6 with a profile on mobile with a VPN? The ipv6 address on desktop works fine.

Any insight or tips on this matter are welcome. Thanks

4 replies

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    • Will_Tisdale
    • 11 days ago
    • Reported - view

    Looks very suspiciously like a VPN app bug. It doesn't look like it's honouring the IPv6 DNS server settings. See if there's any useful connection/app logs maybe?

    Bit of a long shot but you could try putting the IPv6 DNS server addresses in square brackets - for example: [2a07:a8c0::aa:bbbb]  - sometimes they aren't parsed correctly and that can resolve it.

      • XYZ.5
      • 11 days ago
      • Reported - view

      ill reproduce the issue a little later today and report back.

      If this is the case would dns still work? Because when I have the ipv6 addresses active the connection still works normal, domains still resolve and I can access the net. The only thing that doesn't happen is it doesn't apply the block lists from the profile.

      • Will_Tisdale
      • 11 days ago
      • Reported - view

       It's not using NextDNS then. It'll be using a default DNS server because it's clearly not using the IPv6 DNS addresses for some reason.

      • XYZ.5
      • 10 days ago
      • Reported - view

       Ok, so I did a few more tests and found a few things.

      I did an DNS test and results came back as NextDNS, and inside the NextDNS app it also shows the green check that it's connected and using NextDNS.

      I tested on desktop where it's working as intended with IPV6, and it's resolving the same NextDNS server as on mobile. (Ya, the DNS test is replying a IPV4 address, but the client setting is using the same IPV6 address on both desktop and mobile, but only mobile isn't getting the profile and its block lists.)

      I checked the mobile VPN logs but sadly no detailed information on connections, just generic "starting service", "UI successfully connected to the service" type stuff. 

      So probably safe to say the issue is most likely the mobile app in some capacity, even though it's resolving correctly using the same settings as on desktop.

      I've basically just given up using NextDNS for the time being, maybe Google will get off their butt and offer DoH directly on android like they said they would in like Android 13 but never did. DoT is too easy to spot on a network, haha... I got my account setup and ready at least, I'll probably keep trying from time to time and see if whatever the VPN app issue is gets resolved on its own.

      Thanks for the help.

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