1.\" $NetBSD: ifaliases.5,v 1.14 2008/05/29 14:51:25 mrg 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 November 17, 2000 28.Dt IFALIASES 5 29.Os 30.Sh NAME 31.Nm ifaliases 32.Nd interface aliases file 33.Sh DESCRIPTION 34The 35.Nm 36file specifies the additional addresses (aliases) that each interface 37has. 38.Nm 39is processed by 40.Pa /etc/rc.d/network 41at system boot time. 42.Pp 43Each line of the file is of the form: 44.D1 address interface [netmask] 45.Pp 46The 47.Em address 48is a network address of the alias. 49This must be a number, or must be in 50.Pa /etc/hosts , 51since the nameserver is not running at this point. 52.Pp 53The 54.Em interface 55is the network interface the alias will be configured on. 56.Pp 57The 58.Em netmask 59is the netmask of the alias' network address. 60Although this is optional, omitting the netmask is discouraged. 61Omission results in the use of the classful netmask associated with 62.Em address . 63.Sh FILES 64.Pa /etc/ifaliases , 65.Pa /etc/rc.d/network 66.Sh HISTORY 67The 68.Nm 69file appeared in 70.Nx 1.2 . 71.Sh BUGS 72.Nm 73assumes IPv4, and does not support other protocol families. 74Please check 75.Xr rc.conf 5 76for alternatives like 77.Pa /etc/ifconfig.xxN . 78