NFS with nearby host, VM clients?

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I have a laptop, running VMM, with a handful of VM's.  Next to that, I have a pile of disks running on ZFS, and I'd like to give the VM's network access there, for running backups or whatever.

The holdup is that the laptop (pop-OS if that matters -- so Ubuntu, so Debian) automatically prohibits any outside network traffic to the VM's.  Self-contained outward traffic from the VM is fine, like ssh; but the outside host can't see in to any VM, so, for instance, when the VM tries to NFS-mount to the outside, the rpc connection back will fail.

In the past, my way of allowing something like this was to make a new virtual network running on the host, visible for the VM's and reachable by the outside service, but I haven't been able to find how to do that in a modern VMM setup.  I can find, in the GUI:

  QEMU/KVM - Connection Details -> Virtual Networks: "Create a new virtual network"...

...but everything I've tried has failed in one way or another.  Maybe I just don't know how to set that up?

I understand the security concerns, and won't have a problem flatting that down.

If I'm just not looking in the right docs, please point me in the right direction.

Or, if I'm going about this some unwise way, please educate me.


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