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Stefan Agner
205b7dd589
Docker 28 assigns a random MAC address to macvlan endpoints on every endpoint creation, while older engines derived it from the endpoint's IP address. As app containers are recreated on every start, the isolated endpoint would get a different MAC address on each restart, making it impossible to reference the app in router or firewall rules. Pin the MAC address in the endpoint configuration instead, using the same derivation older engines used (02:42 followed by the static IPv4 octets). With the static IP enforced per app, the MAC address stays stable across restarts and updates and only changes when the user assigns a different IP address. Since the MAC address is now fully determined by the configuration, report it in the app info API from the configured IP rather than from the running container's network metadata. This makes it available as soon as isolation is configured, so users can set up router or firewall rules before the first start. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>