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+.\" Copyright (c) 2004 Ruslan Ermilov
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 5, 2010
+.Dt NG_HUB 4
+.Os
+.Sh NAME
+.Nm ng_hub
+.Nd packet distribution netgraph node type
+.Sh SYNOPSIS
+.In netgraph/ng_hub.h
+.Sh DESCRIPTION
+The
+.Nm hub
+node type provides a simple mechanism for distributing packets over
+several links.
+Packets received on any of the hooks are forwarded out the other hooks.
+Packets are not altered in any way.
+.Sh HOOKS
+A
+.Nm hub
+node accepts any request to connect, regardless of the hook name,
+as long as the name is unique.
+.Sh CONTROL MESSAGES
+This node type supports the generic control messages, plus the
+following:
+.Bl -tag -width foo
+.It Dv NGM_HUB_SET_PERSISTENT Pq Ic setpersistent
+This command sets the persistent flag on the node, and takes no arguments.
+.El
+.Sh SHUTDOWN
+This node shuts down upon receipt of a
+.Dv NGM_SHUTDOWN
+control message, or when all hooks have been disconnected.  Setting the
+persistent flag via a
+.Dv NGM_HUB_SET_PERSISTENT
+control message disables automatic node shutdown when the last hook gets
+disconnected.
+.Sh SEE ALSO
+.Xr netgraph 4 ,
+.Xr ng_bridge 4 ,
+.Xr ng_ether 4 ,
+.Xr ng_one2many 4 ,
+.Xr ngctl 8 ,
+.Xr nghook 8
+.Sh HISTORY
+The
+.Nm
+node type appeared in
+.Fx 5.3 .
+.Sh AUTHORS
+.An Ruslan Ermilov Aq ru@FreeBSD.org