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

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

     The ifconfig.if files or variables contain information regarding the con-
     figuration 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).  The variable or file will get evaluated only if the
     interface exists on the system.  Multiple lines can be placed in a vari-
     able or file, and will be evaluated sequentially.  In the case of a vari-
     able, semicolons may be used instead of newlines, as described in

     Normally, a line will be evaluated as command line arguments to
     ifconfig(8).  ``ifconfig nnX'' will be prepended on evaluation.  Argu-
     ments 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

     If a line is empty, or starts with `#', the line will be ignored as com-

     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 netmask media 100baseTX
           inet netmask 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):

           # 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'

     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 auto-

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


     rc.conf(5), ifconfig(8)

NetBSD 5.1                      January 9, 2009                     NetBSD 5.1

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