.\"	$OpenBSD: netstart.8,v 1.31 2022/10/25 17:10:13 kn Exp $
.\"
.\" Copyright (c) 2002, Miodrag Vallat.
.\" All rights reserved.
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.\"     @(#)rc.8	8.2 (Berkeley) 12/11/93
.\"
.Dd $Mdocdate: October 25 2022 $
.Dt NETSTART 8
.Os
.Sh NAME
.Nm netstart
.Nd network startup script
.Sh SYNOPSIS
.Cm sh Pa /etc/netstart
.Op Fl n
.Op Ar interface ...
.Sh DESCRIPTION
.Nm
is a
.Xr sh 1
script invoked by
.Xr rc 8
during an automatic reboot and after single-user mode is exited;
it performs network initialization.
.Pp
.Nm
can also be used to start newly created interfaces.
Its behaviour is controlled to some extent by variables defined in
.Xr rc.conf 8 .
.Pp
During the system boot,
.Nm
is executed.
.Nm
performs the following operations, in the sequence given:
.Pp
.Bl -bullet -compact -offset indent
.It
Configure the loopback interface.
.It
Configure all physical interfaces.
.It
Configure non-physical interfaces that can provide the default gateway,
such as
.Xr aggr 4 ,
.Xr trunk 4 ,
.Xr svlan 4 ,
.Xr vlan 4 ,
.Xr carp 4 ,
and
.Xr pppoe 4 .
.It
Initialize the routing table and set up the default routes.
.It
Configure tunnel interfaces that require a working network
to reach the other end of the tunnel,
such as
.Xr tun 4 ,
.Xr tap 4 ,
.Xr gif 4 ,
.Xr etherip 4 ,
.Xr gre 4 ,
.Xr egre 4 ,
.Xr pflow 4 ,
and
.Xr wg 4 .
.El
.Pp
After the system is completely initialized, it is possible to start
newly created interfaces or apply configuration from
.Xr hostname.if 5
files to an existing interfaces.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl n
Reports the steps that would be taken,
without actually configuring anything.
.El
.Sh SEE ALSO
.Xr multicast 4 ,
.Xr defaultdomain 5 ,
.Xr hostname.if 5 ,
.Xr mygate 5 ,
.Xr ifconfig 8 ,
.Xr rc 8 ,
.Xr rc.conf 8
.Sh HISTORY
The
.Nm
command first appeared in
.Bx 4.0 .