Motivation: bridging or routing is required to enable a connection to be made inward to a QEMU VM. TAP seems like the best of the available solutions. But connecting to a TAP device produces an error when the QEMU bridge helper fails. Example: g1@g1 ~/src/vmb$ qemu-system-x86_64 -net user -net bridge -net nic,model=virtio -enable-kvm -m 4096 -k en-us -display curses /home/g1/src/vmb/tmp/img6/vm.img failed to parse default acl file `/gnu/store/1072khbm9124a8a1pyyyw4mr1p12jsfq-qemu-2.6.0/etc/qemu/bridge.conf' qemu-system-x86_64: -net bridge: bridge helper failed This error was produced with the attached 'img-tap' script. e.g., to build the vm ... ./img-tap mk 1 To (attempt to) run the vm .. ./img-tap run 1 Running Guix built from git checkout on GuixSD: stat ~/.config/guix/latest | grep File: File: '/home/g1/.config/guix/latest' -> '../../src/guix' g1@g1 ~/src/vmb$ git -C ~/.config/guix/latest describe v0.11.0-242-g7ccb874