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drbogar avatar drbogar commented on May 25, 2024

I solved it! 🎉

In the meantime, I found out that DNS resolution does not work only in containers where I have specified the ip address of the docker host as DNS server in the docker-compose file. If I specify the ip address 8.8.8.8, the apt-get update command works fine.

This is because the DNS server communicates via UDP. When Passcore sends the DNS request, the source ip address of the response starts with 172... . This causes Passcore to not accept the DNS response because it came from an unexpected IP address.
This can be solved by adding the host ip address to the ports in the pihole docker-compose file:

ports: 
- "<docker-host-ip-address>:53:53/tcp" 
- "<docker-host-ip-address>:53:53/udp"

from passcore.

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