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Thank you.

VIRT(4)                      Device Drivers Manual                     VIRT(4)

     virt - rump kernel virtual network interface

     The 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

     A virt interface can be created and destroyed in the normal fashion with

     The host's tap(4) interface can be further bridged with hardware
     interfaces to provide full Internet access to a rump kernel.

     rump(3), bridge(4), tap(4), brconfig(8), ifconfig(8)

NetBSD 8.99.34                   July 3, 2013                   NetBSD 8.99.34