\"      $NetBSD: ifconfig.if.5,v 1.22 2020/10/11 22:46:24 kim Exp $
\"
\" Copyright (c) 1996 Matthew R. Green
\" 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.
\"
Dd October 12, 2020
Dt IFCONFIG.IF 5
Os
Sh NAME
Nm ifconfig.if
Nd interface-specific configuration files or variables
Sh DESCRIPTION
The
Nm
files or variables contain information regarding the configuration
of each network interface.
Nm
is processed by
Pa /etc/rc.d/network
at system boot time.
Pp
For each interface
Pq Ar nnX
that is to be configured, there should be either an
Sy ifconfig_nnX
variable in
Xr rc.conf 5 ,
or an
Pa /etc/ifconfig.nnX
file
(such as the
Sy ifconfig_fxp0
variable or the
Pa /etc/ifconfig.fxp0
file for the
Sy fxp0
interface).
Only characters allowed in
Xr sh 1
variables names should be used for
Ar nnX
Po Xr ascii 7
uppercase and lowercase letters, digits, and underscore
Pc .
Pp
The variable or file will get evaluated only if the interface exists on
the system.
Multiple lines can be placed in a variable or file, and will be
evaluated sequentially.
In the case of a variable, semicolons may be used instead of
newlines, as described in
Xr rc.conf 5 .
Ao backslash Ac Ns Ao newline Ac
sequences in files are ignored, so long logical lines may be
made up of several shorter physical lines.
Pp
Normally, a line will be evaluated as command line arguments to
Xr ifconfig 8 .
Dq Li ifconfig Ar nnX
will be prepended on evaluation.
Arguments with embedded shell metacharacters should be quoted in
Xr sh 1
style.
Pp
If the line is equal to
Dq dhcp ,
Xr dhcpcd 8
will be started for the interface.
However, it is instead recommended that
Sy dhcpcd
is set to true in
Xr rc.conf 5
and any per interface configuration or restriction is done in
Xr dhcpcd.conf 5 .
Pp
If the line is equal to
Dq rtsol ,
a dedicated
Xr dhcpcd 8
process will be started for processing received router advertisements
and sending out IPv6 router solicitation messages on the interface.
This is useful on networks where default routes can best be learned
from router advertisements.
However, if
Sy dhcpcd
has been set to true in
Xr rc.conf 5 ,
it is assumed that that
Xr dhcpcd 8
process will take care of sending any necessary router solicitation
messages and processing received router advertisements on all
interfaces, and therefore no per-interface process is started.
Pp
If a line is empty, or starts with
Sq # ,
the line will be ignored as comment.
Pp
If a line starts with
Sq \&! ,
the rest of line will get evaluated as shell script fragment.
Shell variables declared in
Pa /etc/rc.d/network
are accessible but may not be modified.
The most useful variable is
Li $int ,
as it will be bound to the interface being configured with the file.
Pp
For example, the following illustrates static interface configuration:
Bd -literal -offset indent
# IPv4, with an alias
inet 10.0.1.12 netmask 255.255.255.0 media 100baseTX
inet 10.0.1.13 netmask 255.255.255.255 alias
# let us have IPv6 address on this interface
inet6 2001:db8::1 prefixlen 64 alias
# have subnet router anycast address too
inet6 2001:db8:: prefixlen 64 alias anycast
Ed
Pp
For networks that do not use a virtual address for the default gateway
that could be set using a single address in
Sy defaultroute6 ,
static IPv6 address configuration could use the
Dq rtsol
keyword instead to solicit router advertisements for learning a default
route and even achieving route redundancy given multiple responding
routers:
Bd -literal -offset indent
inet6 2001:db8::100 prefixlen 64 alias
rtsol
Ed
Pp
The following example sets a network name for a wireless interface
(using quotes to protect special characters in the name),
and starts
Xr dhcpcd 8 :
Bd -literal -offset indent
ssid 'my network'
dhcp
Ed
Pp
The following example is for dynamically-created pseudo interfaces like
Xr gif 4 .
Earlier versions of
Pa /etc/rc.d/network
required an explicit
Sq create
command for such interfaces,
but creation is now handled automatically.
Bd -literal -offset indent
up
# configure IPv6 default route toward the interface
!route add -inet6 default ::1
!route change -inet6 default -ifp $int
Ed
Sh FILES
Pa /etc/rc.d/network
Sh SEE ALSO
Xr rc.conf 5 ,
Xr ifconfig 8

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.