.\" Copyright (c) 2004 Ruslan Ermilov
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.\" $FreeBSD$
.\"
.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 Mt ru@FreeBSD.org