To change the default settings of docker - Bridge settings and IP addresses of containers -, we follow the below steps:

Then we take the docker0 bridge interface down:

We delete the default docker0 bridge interface:

We flush the POSTROUTING chain using the below command so it deletes all the rules related to it:

We change the bridge in the "/etc/default/docker" file:

Then we create the "br1" Linux bridge:

We assign an IP address to the new bridge:

Then we enable it using the below command:

Finally, we start our docker services as follows:

We check if our new bridge was taken into account by Linux using the below command: