The default bridge network is considered a legacy detail of Docker and is not recommended for production use. Configuring it is a manual operation, and it has technical shortcomings.
The next version Unraid can consider to create a default 'user bridge' with network: 172.18.0.0/16 (disable the old/default 'bridge' network 172.17.0.0/16) on initialized installation and generate an unused ip address automatically when a new docker container is created. It also allow user to assign an IP for a container within the 172.18.0.x.
(Added in 6.5.1) Docker - user defined bridge networks
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I recommand to replace the default bridge with a 'user bridge'.
The 'user bridge' is more powerful and safer than the 'default bridge' as the official docker document describe:
Use the default bridge network
The next version Unraid can consider to create a default 'user bridge' with network: 172.18.0.0/16 (disable the old/default 'bridge' network 172.17.0.0/16) on initialized installation and generate an unused ip address automatically when a new docker container is created. It also allow user to assign an IP for a container within the 172.18.0.x.