Note: I originally posted an update to an existing thread over at Prereleases(https://forums.unraid.net/bug-reports/prereleases/no-custom-network-after-updating-to-714-and-beta-72-r3995/), but since 7.2.0 has gone stable, perhaps is best to post here.

I've had this issue on the 7.2 betas and at that time rolled back to 7.1.4 to workaround. Now that 7.2 is now released, I upgraded on day 1 (last week); no issues with br0 missing from docker networks on upgrade. However this morning I needed to reboot the server and struck this issue when one of my containers using br0 network couldn't start. Investigated and found br0 was missing from docker network ls. After multiple reboots, disabling docker service and re-enabling etc.., I was unable to bring back the br0 docker network automatically. Interesting, when i switched my network config from ipv4+ipv6 to ipv4 only that brought back the br0 docker network. However one of my containers (matter-server) requires ipv6 enabled so ipv4 only was not an option.

In the logs i can see these events when working successfully:

Nov 2 08:10:02 apollo rc.docker: Processing... br0

Nov 2 08:10:02 apollo rc.docker: created network ipvlan br0 with subnets: 10.0.0.0/24; fd69:fb66:5f3:6f4c::/64;

Compared to when not creating br0 docker network:

Nov 2 08:59:33 apollo rc.docker: Processing... br0

Nov 2 08:59:33 apollo root: multiple overlapping subnet configuration is not supported

To remediate it seems that if manually create the docker network br0, it works without issue.


docker network create \

-d ipvlan \

--subnet=10.0.0.0/24 \

--gateway=10.0.0.1 \

--ipv6 \

--subnet=fd69:fb66:5f3:6f4c::/64 \

-o parent=br0 \

--ipam-opt AuxiliaryAddresses=server=10.0.0.100 \

br0

I've attached the diagnostics. Hopefully devs can take a look at it and find a solution for a future update; it appears there is a regression in 7.2 update as there were no such issues on 7.1.4.

diagnostics-20251102-0917.zip

If this keeps happening, losing the Docker br0 network after reboot, I suggest creating a new bug report here: Stable Releases - Bug Reports

15 hours ago, JorgeB said:

If this keeps happening, losing the Docker br0 network after reboot, I suggest creating a new bug report here: Stable Releases - Bug Reports

Rebooted server again, and it’s still not creating br0 docker network. As suggested, I’ll raise a bug report.