.\"	$OpenBSD: netstart.8,v 1.21 2016/09/05 12:58:17 jmc Exp $
.\"
.\" Copyright (c) 2002, Miodrag Vallat.
.\" 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 ``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 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.
.\"
.\"     @(#)rc.8	8.2 (Berkeley) 12/11/93
.\"
.Dd $Mdocdate: September 5 2016 $
.Dt NETSTART 8
.Os
.Sh NAME
.Nm netstart
.Nd command script for network startup
.Sh SYNOPSIS
.Nm /etc/netstart
.Op Ar interface ...
.Sh DESCRIPTION
.Nm
is the command script that is invoked by
.Xr rc 8
during an automatic reboot and after single-user mode is exited;
it performs network initialization.
.Pp
The
.Nm
script can also be used to start newly created bridges or interfaces,
or reset existing interfaces to their default state.
The behaviour of this script is (or can be) controlled to some
extent by variables defined in
.Xr rc.conf 8 ,
which specifies which daemons and services are to be run.
.Pp
During the system boot,
.Nm
is executed.
.Nm
performs the following operations, in the sequence given:
.Pp
.Bl -bullet -compact -offset indent
.It
Set the machine's name.
.It
Configure the loopback interface.
.It
Configure all the physical interfaces.
.It
Configure the following non-physical interfaces:
.Xr trunk 4 ,
.Xr vlan 4 ,
.Xr pfsync 4 ,
and
.Xr carp 4 .
.It
Initialize the routing table and set up the default routes.
.It
Configure the remaining non-physical interfaces:
.Xr pppoe 4 ,
.Xr gif 4 ,
and
.Xr gre 4 .
.It
Configure all
.Xr bridge 4
interfaces.
.El
.Pp
After the system is completely initialized, it is possible to start a
newly created interface or
.Xr bridge 4 ,
or reset an existing interface to its default state, by invoking
the following, where
.Ar foo0
is the interface or bridge name:
.Pp
.D1 # sh /etc/netstart foo0
.Sh MULTICAST ROUTING
To enable
.Xr multicast 4
routing, the
.Va net.inet.ip.mforwarding
and/or
.Va net.inet6.ip6.mforwarding
.Xr sysctl 8
variables should be set to 1.
Multicast routing is only enabled if
.Va multicast
is set to
.Qq YES
in
.Xr rc.conf.local 8 .
Other cases are configuration errors
and will cause multicast routing not to be enabled.
.Sh SEE ALSO
.Xr multicast 4 ,
.Xr defaultdomain 5 ,
.Xr hostname.if 5 ,
.Xr myname 5 ,
.Xr ifconfig 8 ,
.Xr rc 8 ,
.Xr rc.conf 8
.Sh HISTORY
The
.Nm
command first appeared in
.Bx 4.0 .