Allow single 'Emulated VLAN' network interface without 'Shared Network' network interface

[nicerloop]

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Description

Allow building VMs with only a single 'Emulated VLAN' network interface, without 'Shared Network' network interface, to have all network access through the single 'Emulated VLAN' interface in user space.

Use Case(s)

I want to trace network calls from the VM using mitmdump in local-capture mode (https://docs.mitmproxy.org/stable/concepts/modes/#local-capture), and need network access to originate from a user space process instead of being transparently NATed by the OS through a 'Shared Network' interface.

Potential configuration

Potential References

• https://docs.getutm.app/settings-qemu/devices/network/network/#network-mode
• https://naveenrajm7.github.io/vagrant_utm/boxes/creating_utm_box.html
• https://docs.mitmproxy.org/stable/concepts/modes/#local-capture