wiki/docs/Docker/fix-apipa-veth.md

Fix APIPA (veth)

Problem

On Debian 11, when:

1. Using docker containers that use the host network mode.
2. PreferredTechnologies is set to ethernet,[...] in /etc/connman/main.conf.
   • This may not be a problem when ethernet is plugged in, not just wifi.

The system uses a veth interface to connect to the internet, which uses an APIPA (169.254..) IP address, so the system can only contact devices on the LAN.

Solution

Edit /etc/connman/main.conf and uncomment the line # NetworkInterfaceBlacklist = vmnet,vboxnet,virbr,ifb,ve-,vb-

Result:

NetworkInterfaceBlacklist = vmnet,vboxnet,virbr,ifb,ve-,vb-

References

• A tale of Docker and Linux ConnMan
• Arch Linux Docs