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