NOS app and NU.nl APP not working with IPv6 enabled

[arjanh]

Hi All,

I don't know if it has to do with the new version 24.7, but I did not encounter this on the previous version.
NOS app and NU.nl app do not work with IPv6 enabled other sites or apps are working with IPv6.
When I disable IPv6 on the network the apps are working when I reenable IPv6 it will fail again.

I have run some packet capture but cannot find anything strange on the capture.
Is anyone else encountering the same issue?

[meyergru]

Works for me. Probably geoblocking active on their websites and your IPv6 is mislocated by them?

[doktornotor]

https://www.nu.nl/ works fine here. No idea what's NOS app. You might have path MTU issues with some sites.

[arjanh]

The websites always work, it is the app on android that is not working until I disable IPv6 then the apps work.
It looks like there is an issue with the CDN URLs what is behind the apps and the API URL that they are addressing.

My IPv6 address is from KPN and it resolves to NL when I check my /48 range.
MTU is 1500 on the PPPoE interface speed tests are all good, I have no dropped packet in the packet capture or whatsoever, I believe it happened after the upgrade to 24.7

I will do some more troubleshooting

[doktornotor]

MTU 1500 on PPPoE does not sound correct.

[arjanh]

I think I have found the issue, but do not know the solution yet ;D
it is a DNS issue and specific to ipv6 when select the ipv6 address of the opnsense appliance it doesn't work.
it doesn't give back addresses on the ipv6 interface it works on the ipv4 of the same interface but not for the ipv6 version.

I'm using the system-defined servers and used 2606:4700:4700::1111 and 2620:fe::fe for ipv6 there but it doesn't reply via the appliance itself.
I have turned unbound on and off no difference

Will investigate further.