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I'm running a Debian container on my Manjaro host. Until recently, apt update worked fine, but now it only works if I set the network mode to host. Otherwise, the command hangs at "Connecting to deb.debian.org".

Works with --network=host:

docker run --rm -it --network=host debian bash
root@container:/# apt update
Get:1 http://deb.debian.org/debian bookworm InRelease [151 kB]
Reading package lists... Done

Fails (default bridge network):

docker run --rm -it debian bash
root@container:/# apt update
0% [Connecting to deb.debian.org]   # Hangs indefinitely

What I've tried:

  • Restarting Docker (sudo systemctl restart docker)

  • Checking iptables rules (sudo iptables -L -v -n)

  • Checking DNS inside the container (cat /etc/resolv.conf → it uses nameserver 127.0.0.11)

  • Testing network connectivity inside the container:

    ping 8.8.8.8  # Hangs
nslookup google.com  # Fails

  • I followed this Stack Overflow thread, but the suggested solutions (such as setting --dns 8.8.8.8 or modifying iptables) did not resolve the issue.

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It sounds like the iptables forwarding rules are no longer working. You said you checked them, but (assuming this is a docker-engine environment) I'm not sure how anyone could be sure they are correct without tearing them apart and putting them back together one rule at time.

I would reinstall Docker. Actually, first I would also look online to see if there are other reports of a recent Manjaro update breaking Docker. Maybe something in the base OS firewall configuration changed something that the Docker rules were depending on.

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