Thing is though, that there are better ways to communicate locally: AF_VSOCK is an alternative to AF_INET/AF_INET6 for local communication between VMs and hosts. In many ways it behaves very similar to TCP. It is similar enough so that you can just do ssh-via-AF_VSOCK. As opposed to AF_INET/AF_INEt6 it requires next to no configuration, your really just have to enable the knob in your VMM, and have a somewhat non-ancient Linux distribution as guest.