ifconfig.if(5) - NetBSD Manual Pages

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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). 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. 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 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 the line is equal to ``rtsol'', kernel processing of router advertise- ments will be enabled and an IPv6 router solicitation message will be sent out on the interface. This is useful on networks where default routes can best be learned from router advertisements. However, if dhcpcd has been set to true in rc.conf(5), it is assumed that dhcpcd(8) will take care of sending any necessary router solicitation messages and processing received router advertisements through its configuration in dhcpcd.conf(5) instead. If a line is empty, or starts with `#', the line will be ignored as com- ment. 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 For networks that do not use a virtual address for the default gateway that could be set using a single address in defaultroute6, static IPv6 address configuration could use the ``rtsol'' keyword instead to solicit router advertisements for learning a default route and even achieving route redundancy given multiple responding routers: inet6 2001:db8::100 prefixlen 64 alias rtsol 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 auto- matically. up # configure IPv6 default route toward the interface !route add -inet6 default ::1 !route change -inet6 default -ifp $int
rc.conf(5), ifconfig(8) NetBSD 9.99 April 15, 2020 NetBSD 9.99
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