Docs feedback: Docker executor – Please clarify on default Docker container network configuration

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Currently, from the Docker network configuration documentation page, I'm not able to tell …

• what the default network settings are
• what will happen if FF_NETWORK_PER_BUILD = true is set
• how to configure image/services network settings in a job.

Please clarify:

1. If nothing is set in configuration, which containers or host connections can be reached by any CI/CD container?
2. If FF_NETWORK_PER_BUILD = true is set in configuration, which containers or host connections can be reached by any CI/CD container?
3. How can I define Docker network settings for each image/service from within a CI/CD job?

NB: I'm particularly looking for information regarding GitLab Runner for Windows.

See: https://docs.gitlab.com/runner/executors/docker.html#network-configurations

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