Blokada does not work with Telekom IPv6 APN

[Phoner]

Hello!

I use Blokada 5 (22.3.8), downloaded from blokada.org, on Android 11.

As you can read here:

Internet stops working if connected via mobile network (Blokada 5 on Android 10)

Hello Community! I’m running Blokada 5.10 (downloaded from F-Droid) on Android 10 (more or less stock Android, because it is a Fairphone 3). Blokada works fine, if it is connected via WiFi. But if I switch to the mobile network (PennyMobil, a reseller of Congstar respectively Telekom Germany) not any internet connection of any app is established. I use the blocklists “Energized Blu” and “DuckDuckGo”. In “All networks” and also in mobile and WiFi networks I use “Encrypt DNS” and “Digitale Gesel…

I had problems connecting to the Internet via the mobile network. Now I’ve found the reason. Since mid 2020 the German provider Telekom uses the APN “internet.v6.telekom” to allow access to IPv6 addresses. But for some reason Blokada does not work with that APN. Now I changed it to the old APN “internet.telekom” and voilá: Blokada operates well without any other changes. I checked here https://ipv6test.google.com and here http://test-ipv6.com/ if I can still connect with IPv6-addresses and it works. I also double-checked some apps and could not find any error. So this solution works for me.

But anyway: It is weird. And it would be nice if the developers of Blokada could find a better solution to make the software working with the new APN “internet.v6.telekom”. This issue had also been reported here

Internet problems on mobile network with native ipv6 APN

Hi guys, I’m am using blokada 5 libre for quite a long time. I was facing some issues in the past with internet problems when blokada is activated and couldn’t find out what the reason was. I am using blokada 5.16.0 right now and I am on Android 11 (Galaxy S10). I deactivated the encrypt dns feature, used different alternative dns servers (right now I use “prefer network dns” which seems to work best for me). When I am on wifi, sometimes when I change the wifi network the internet is frozen,…

but seems not to be solved until today. Maybe I’m on the wrong track or maybe I missed something. Let me know.

[balboah]

Hello,

Thanks for the great report with all the details!
It is a tricky case that you managed to discover and also tricky for us to debug.

Could you provide the details I asked for in the previous post that you linked to (while using the new APN)? If there are any errors occurring within the app, a log file would also help.
Don’t post it in public as it might contain sensitive information, send it to hello@blokada.org while linking to this post.

If by any chance you would give Blokada v6 a try, I’m sure it would work for you as expected.
There’s a one week free trial so you’ll have a chance to verify that it does.