Windows hosts file has wrong IP address for host.docker.internal

[jcoutch]

• I have tried with the latest version of my channel (Stable or Edge)
• I have uploaded Diagnostics

Expected behavior

Hosts file contains the correct IP address for the primary network interface for both host.docker.internal and gateway.docker.internal.

Actual behavior

Docker for Windows pulls the IP address of a random network adapter (usually one that's not even connected), and uses that as the IP address.

Information

• Windows Version: 10.0.19042.546
• Docker Desktop Version: 2.4.0.0
• Are you running inside a virtualized Windows e.g. on a cloud server or on a mac VM: No

Steps to reproduce the behavior

Have multiple network cards connected to a machine, and randomly connect/disconnect them to get the wrong IP address populated.

Proposed solution

Allow the user to specify which network adapter to use for populating the host.docker.internal and gateway.docker.internal addresses. At the very minimum, give us the option to turn the auto-update of the IP address off. Or, even better, define a loopback network interface with a known IP address so you don't have to mess with the hosts file constantly!

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[jcoutch]

This is still an issue with 3.1.0 (51484).

[docker-robott]

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