With the default network mode (bridge), the container has its network namespace isolated from the host, meaning the loopback address does not have the same meaning in the context of the container and the host.

You should point pihole to one of the IP addresses used by the host system, such as the IP address on the physical NIC, of the IP address on the bridge created for your Docker network.

For more information about Docker networking:

• https://docs.docker.com/network/
• https://docs.docker.com/network/bridge/
• https://docs.docker.com/network/host/

With the default network mode (bridge), containers have their network namespace isolated from that of the host, the loopback address does not have the same meaning in the context of one container as it does in the context of the host.

You should point pihole to one of the IP addresses used by the host system, such as the IP address on the physical NIC or the IP address on the bridge created for your Docker network.

For more information about Docker networking:

• https://docs.docker.com/network/
• https://docs.docker.com/network/bridge/
• https://docs.docker.com/network/host/