Hi all, thank you for any insight.

I have a fairly basic network setup I believe.

Under the Routing Table, I notice a network with the label docker0, then one with 'br-[NETWORK ID from my custom docker network 'docknet'] (br-53a22d28af07).

1) What is the difference between the docker0 & br-53a22d28af07

docker 0 is the interface made by teh docker/dockerd sytem application and is used for the docker bridge driver.

the br-53a22d28af07 is a shim bridge that conects over and uses teh br0 netork to give the docker a lan IP. This tells me that you are running a docker at a custom br0 and have givein it a static IP.

This is normal and assit docker and the container application at asigning a IP off the interface of br0

review more info here:

in this case the docker network "docnet" made this shim bridge and is using that as a way to conect to br0 interface for its upstream connection to the internet so dockers connected to you docknet network have internet.

use docker inspect commands to confirm...

docker network inspect docknet

Thank you @bmartino1 for taking the time to reply. Sorry for my delay in response.