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Ansible: What are the network bridges for?


I have trouble understanding the section about network bridges in this deployment guide.

These are the general questions I'm trying to find answers for:

  • What are the bridges necessary for? How are they used? (Why) Isn't it possible to use the physical interfaces directly?
  • What are the bridges connecting?
  • (How do I configure the bridges for my setup?)

My setup: I have two identical machines running Ubuntu 18.04, both have two network interfaces.

I know I'm asking really basic questions here, but that's because I feel the docs are seriously lacking here, and the basic info I read about bridges didn't help me to understand what I'm supposed to do at this point of the deployment.

Thank you to everyone who's trying to help me!