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NetBSD 6.1.5 - man page for ifconfig.if (netbsd section 5)

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IFCONFIG.IF(5)			     BSD File Formats Manual			   IFCONFIG.IF(5)

NAME
     ifconfig.if -- interface-specific configuration files or variables

DESCRIPTION
     The ifconfig.if files or variables contain information regarding the configuration of each
     network interface.  ifconfig.if is processed by /etc/rc.d/network at system boot time.

     For each interface (nnX) that is to be configured, there should be either an ifconfig_nnX
     variable in rc.conf(5), or an /etc/ifconfig.nnX file (such as the ifconfig_fxp0 variable or
     the /etc/ifconfig.fxp0 file for the fxp0 interface).  Only characters allowed in sh(1) vari-
     ables names should be used for nnX (ascii(7) uppercase and lowercase letters, digits, and
     underscore).

     The variable or file will get evaluated only if the interface exists on the system.  Multi-
     ple 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 rc.conf(5).
     <backslash><newline> sequences in files are ignored, so long logical lines may be made up of
     several shorter physical lines.

     Normally, a line will be evaluated as command line arguments to ifconfig(8).  ``ifconfig
     nnX'' will be prepended on evaluation.  Arguments with embedded shell metacharacters should
     be quoted in sh(1) style.

     If the line is equal to ``dhcp'', dhcpcd(8) will be started for the interface.  However, it
     is instead recommended that dhcpcd is set to true in rc.conf(5) and any per interface con-
     figuration or restriction is done in dhcpcd.conf(5).

     If a line is empty, or starts with '#', the line will be ignored as comment.

     If a line starts with '!', the rest of line will get evaluated as shell script fragment.
     Shell variables declared in /etc/rc.d/network are accessible but may not be modified.  The
     most useful variable is $int, as it will be bound to the interface being configured with the
     file.

     For example, the following illustrates static interface configuration:

	   # 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

     The following illustrates dynamic configuration setup with dhclient(8) and rtsol(8):

	   up
	   # autoconfigure IPv4 address
	   !dhclient $int
	   # autoconfigure IPv6 address.  Be sure to set $ip6mode to autohost.
	   !rtsol $int

     The following example sets a network name for a wireless interface (using quotes to protect
     special characters in the name), and starts dhcpcd(8):

	   ssid 'my network'
	   dhcp

     The following example is for dynamically-created pseudo interfaces like gif(4).  Earlier
     versions of /etc/rc.d/network required an explicit 'create' command for such interfaces, but
     creation is now handled automatically.

	   up
	   # configure IPv6 default route toward the interface
	   !route add -inet6 default ::1
	   !route change -inet6 default -ifp $int

FILES
     /etc/rc.d/network

SEE ALSO
     rc.conf(5), ifconfig(8)

BSD					  April 7, 2011 				      BSD
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