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+.\"	$NetBSD: hvn.4,v 1.2 2021/10/12 07:43:41 wiz Exp $
+.\"
+.\"	$OpenBSD: hvn.4,v 1.5 2016/10/07 14:42:27 jmc Exp $
+.\"
+.\" Copyright (c) 2016 Mike Belopuhov
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd October 12, 2021
+.Dt HVN 4
+.Os
+.Sh NAME
+.Nm hvn
+.Nd Hyper-V networking interface
+.Sh SYNOPSIS
+.Cd "hvn* at vmbus?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for a Network Virtual Service Client (NetVSC),
+a virtual networking interface that relays device requests to the Virtual
+Service Provider (VSP) in the management operating system via the VMBus.
+.Pp
+NetVSC emulates an RNDIS 1.0 compliant device on top of a custom NVS
+protocol operating over the VMBus channel ring.
+.Pp
+Individual networking interfaces can be renamed by issuing a
+.Cm Rename-VMNetworkAdapter
+PowerShell command in the management domain.
+In order to enable sending and receiving of IEEE 802.1q (VLAN) frames,
+the virtual port needs to be put into
+.Em Trunk
+mode with the
+.Cm Set-VMNetworkAdapterVlan
+command.
+.Sh SEE ALSO
+.Xr arp 4 ,
+.Xr netintro 4 ,
+.Xr vlan 4 ,
+.Xr ifconfig 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 6.1
+and appeared in
+.Nx 8.0 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Mike Belopuhov Aq Mt mikeb@openbsd.org
+based on the
+.Fx
+driver by the Microsoft BSD Integration Services Team
+.Aq Mt bsdic@microsoft.com
+and ported to
+.Nx
+by
+.An NONAKA Kimihiro .