https://stackoverflow.com/questions/48941494
For example, I want to be able to do on guest:
nc -l -p 45455
and then on host:
echo asdf | nc localhost 45455
and have the guest receive the `asdf`.
My initial goal with this is to setup `gdbserver`, but this could also
be used for fun things like simulating clusters.
In QEMU for example, I can do that with:
-netdev user,hostfwd=tcp::45455-:45455,id=net0
I am also interested in the guest to host direction, although that I
haven't managed to do in QEMU yet:
https://serverfault.com/questions/769874/how-to-forward-a-port-from-guest-to-host-in-qemu-kvm
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