Thanks Devon, this is helpful! I'm using 0intro's repo, and it seems to already set PLAN9TAP=ethertap for linux (link). The 9vx doc suggests `tap 9vx -r plan9 -u glenda` should work; but currently I'm missing tunctl, /sbin/ifconfig and /usr/sbin/brctl on the host. They seem to be easy to install. I'll try later and report back.