27 lines
853 B
Markdown
27 lines
853 B
Markdown
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# Fix APIPA (veth)
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## Problem
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On Debian 11, when:
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1. Using docker containers that use the `host` network mode.
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2. `PreferredTechnologies` is set to `ethernet,[...]` in `/etc/connman/main.conf`.
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- This may not be a problem when ethernet is plugged in, not just wifi.
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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.
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## Solution
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Edit `/etc/connman/main.conf` and uncomment the line `# NetworkInterfaceBlacklist = vmnet,vboxnet,virbr,ifb,ve-,vb-`
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Result:
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```conf
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NetworkInterfaceBlacklist = vmnet,vboxnet,virbr,ifb,ve-,vb-
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```
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## References
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- [A tale of Docker and Linux ConnMan](https://sitaram.substack.com/p/a-tale-of-docker-and-linux-connman)
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- [Arch Linux Docs](https://wiki.archlinux.org/title/ConnMan#Blacklist_interfaces)
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