| VIRT(4) | Device Drivers Manual | VIRT(4) | 
virt —
virt interface acts as a link between a rump kernel
  and a host tap(4) interface.
  Interface number <n> always corresponds with the host tap interface
  tap<n>. All data sent by virt is written into
  /dev/tap<n> and all data read from
  /dev/tap<n> is passed as Ethernet input to the
  rump kernel.
A virt interface can be created and
    destroyed in the normal fashion with
    ifconfig(8).
The host's tap(4) interface can be further bridged with hardware interfaces to provide full Internet access to a rump kernel.
| July 3, 2013 | NetBSD 10.1 |