1.\" $NetBSD: ifconfig.if.5,v 1.13 2009/01/09 09:39:05 apb Exp $ 2.\" 3.\" Copyright (c) 1996 Matthew R. Green 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, 20.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.Dd January 9, 2009 28.Dt IFCONFIG.IF 5 29.Os 30.Sh NAME 31.Nm ifconfig.if 32.Nd interface-specific configuration files or variables 33.Sh DESCRIPTION 34The 35.Nm 36files or variables contain information regarding the configuration 37of each network interface. 38.Nm 39is processed by 40.Pa /etc/rc.d/network 41at system boot time. 42.Pp 43For each interface 44.Pq Ar nnX 45that is to be configured, there should be either an 46.Sy ifconfig_nnX 47variable in 48.Xr rc.conf 5 , 49or an 50.Pa /etc/ifconfig.nnX 51file 52(such as the 53.Sy ifconfig_fxp0 54variable or the 55.Pa /etc/ifconfig.fxp0 56file for the 57.Sy fxp0 58interface). 59The variable or file will get evaluated only if the interface exists on 60the system. 61Multiple lines can be placed in a variable or file, and will be 62evaluated sequentially. 63In the case of a variable, semicolons may be used instead of 64newlines, as described in 65.Xr rc.conf 5 . 66.Pp 67Normally, a line will be evaluated as command line arguments to 68.Xr ifconfig 8 . 69.Dq Li ifconfig Ar nnX 70will be prepended on evaluation. 71Arguments with embedded shell metacharacters should be quoted in 72.Xr sh 1 73style. 74.Pp 75If the line is equal to 76.Dq dhcp , 77.Xr dhcpcd 8 78will be started for the interface. 79.Pp 80If a line is empty, or starts with 81.Sq # , 82the line will be ignored as comment. 83.Pp 84If a line starts with 85.Sq \&! , 86the rest of line will get evaluated as shell script fragment. 87Shell variables declared in 88.Pa /etc/rc.d/network 89are accessible but may not be modified. 90The most useful variable is 91.Li $int , 92as it will be bound to the interface being configured with the file. 93.Pp 94For example, the following illustrates static interface configuration: 95.Bd -literal -offset indent 96# IPv4, with an alias 97inet 10.0.1.12 netmask 255.255.255.0 media 100baseTX 98inet 10.0.1.13 netmask 255.255.255.255 alias 99# let us have IPv6 address on this interface 100inet6 2001:db8::1 prefixlen 64 alias 101# have subnet router anycast address too 102inet6 2001:db8:: prefixlen 64 alias anycast 103.Ed 104.Pp 105The following illustrates dynamic configuration setup with 106.Xr dhclient 8 107and 108.Xr rtsol 8 : 109.Bd -literal -offset indent 110up 111# autoconfigure IPv4 address 112!dhclient $int 113# autoconfigure IPv6 address. Be sure to set $ip6mode to autohost. 114!rtsol $int 115.Ed 116.Pp 117The following example sets a network name for a wireless interface 118(using quotes to protect special characters in the name), 119and starts 120.Xr dhcpcd 8 : 121.Bd -literal -offset indent 122ssid 'my network' 123dhcp 124.Ed 125.Pp 126The following example is for dynamically-created pseudo interfaces like 127.Xr gif 4 . 128Earlier versions of 129.Pa /etc/rc.d/network 130required an explicit 131.Sq create 132command for such interfaces, 133but creation is now handled automatically. 134.Bd -literal -offset indent 135up 136# configure IPv6 default route toward the interface 137!route add -inet6 default ::1 138!route change -inet6 default -ifp $int 139.Ed 140.Sh FILES 141.Pa /etc/rc.d/network 142.Sh SEE ALSO 143.Xr rc.conf 5 , 144.Xr ifconfig 8 145