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A per-user NAT zone to support egress from internal "fabric" networks.
This is still very much alpha. Use at your own risk!
The basic idea is that an instance with only fabric interfaces should still be able to reach out to the internet. We'll have a (lazily provisioned) "nat" zone for each user that will be the default gateway on that user's VLAN (see VXLAN). This nat zone should be an implementation detail from the user's point of view.
VMs that have a public interface won't require this gateway, so the code path that does the lazy provision can skip these cases.
These zones will be removed automatically when the instance count on the fabric network drops to 0. This is handled by a workflow job.