1.\" $OpenBSD: netstart.8,v 1.16 2007/05/31 19:19:59 jmc Exp $ 2.\" 3.\" Copyright (c) 2002, Miodrag Vallat. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.\" @(#)rc.8 8.2 (Berkeley) 12/11/93 27.\" 28.Dd $Mdocdate: May 31 2007 $ 29.Dt NETSTART 8 30.Os 31.Sh NAME 32.Nm netstart 33.Nd command scripts for network startup 34.Sh SYNOPSIS 35.Pa /etc/netstart 36.Op Ar interface ... 37.Sh DESCRIPTION 38.Nm 39is the command script that is invoked by 40.Xr rc 8 41during an automatic reboot and after single user mode is exited; 42it performs network initialization. 43.Pp 44The 45.Nm 46script can also be used to start newly created bridges or interfaces, 47or reset existing interfaces to their default state. 48The behaviour of this script is (or can be) controlled to some 49extent by variables defined in 50.Pa /etc/rc.conf , 51which specifies which daemons and services are to be run. 52.Pp 53During the system boot, 54.Nm 55is executed. 56.Nm 57performs the following operations, in the sequence given: 58.Pp 59.Bl -bullet -compact -offset indent 60.It 61Set the machine's name. 62.It 63Configure the loopback interface. 64.It 65Configure all the physical interfaces. 66.It 67Configure the following non-physical interfaces: 68.Xr trunk 4 , 69.Xr vlan 4 , 70.Xr pfsync 4 , 71and 72.Xr carp 4 . 73.It 74Initialize the routing table and set up the default routes. 75.It 76Configure the remaining non-physical interfaces: 77.Xr pppoe 4 , 78.Xr gif 4 , 79and 80.Xr gre 4 . 81.It 82Configure all 83.Xr bridge 4 84interfaces. 85.El 86.Pp 87After the system is completely initialized, it is possible to start a 88newly created interface or 89.Xr bridge 4 , 90or reset an existing interface to its default state, by invoking 91the following, where 92.Ar foo0 93is the interface or bridge name: 94.Pp 95.D1 # sh /etc/netstart foo0 96.Sh MULTICAST ROUTING 97To enable 98.Xr multicast 4 99routing, the 100.Va net.inet.ip.mforwarding 101and/or 102.Va net.inet.ip6.mforwarding 103.Xr sysctl 8 104variables should be set to 1. 105Routing to the 224.0.0.0/4 net is set up using values from 106.Pa /etc/rc.conf 107according to these rules: 108.Bl -bullet 109.It 110The default. 111If the multicast settings are as follows 112then multicast routing will not be enabled. 113.Bd -literal -offset indent 114multicast_host=NO 115multicast_router=NO 116.Ed 117.It 118If the multicast settings are as follows 119then multicast routing will be enabled, 120but no multicast route will be set up. 121It is expected that a routing daemon, such as 122.Xr mrouted 8 , 123will be started as well. 124.Bd -literal -offset indent 125multicast_host=NO 126multicast_router=YES 127.Ed 128.It 129If the multicast settings are as follows 130then multicast routing will be enabled, 131using the default interface, 132or the interface name specified by 133.Va multicast_host . 134.Bd -literal -offset indent 135multicast_host=YES 136multicast_router=NO 137.Ed 138or: 139.Bd -literal -offset indent -compact 140multicast_host=foo0 # interface name 141multicast_router=NO 142.Ed 143.It 144Other cases are configuration errors and will cause multicast routing not to be 145enabled. 146.El 147.Sh SEE ALSO 148.Xr multicast 4 , 149.Xr defaultdomain 5 , 150.Xr hostname.if 5 , 151.Xr myname 5 , 152.Xr ifconfig 8 , 153.Xr rc 8 , 154.Xr rc.conf 8 155.Sh HISTORY 156The 157.Nm 158command first appeared in 159.Bx 4.0 . 160