1.\" $NetBSD: virt.4,v 1.3 2013/07/03 19:21:12 pooka Exp $ 2.\" 3.\" Copyright (c) 2010 Antti Kantee 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.Dd July 3, 2013 27.Dt VIRT 4 28.Os 29.Sh NAME 30.Nm virt 31.Nd rump kernel virtual network interface 32.Sh DESCRIPTION 33The 34.Nm 35interface acts as a link between a rump kernel and a host 36.Xr tap 4 37interface. 38Interface number <n> always corresponds with the host tap interface tap<n>. 39All data sent by 40.Nm 41is written into 42.Pa /dev/tap<n> 43and all data read from 44.Pa /dev/tap<n> 45is passed as Ethernet input to the rump kernel. 46.Pp 47A 48.Nm 49interface can be created and destroyed in the normal fashion with 50.Xr ifconfig 8 . 51.Pp 52The host's 53.Xr tap 4 54interface can be further bridged with hardware interfaces to provide 55full Internet access to a rump kernel. 56.Sh SEE ALSO 57.Xr rump 3 , 58.Xr bridge 4 , 59.Xr tap 4 , 60.Xr brconfig 8 , 61.Xr ifconfig 8 62