NAMEifup - bring a network interface up
ifdown - take a network interface down
ifquery - parse interface configuration
SYNOPSISifup [-nv] [--no-act] [--verbose] [-i FILE|--interfaces=FILE] [--allow CLASS] -a|IFACE...
ifdown [-nv] [--no-act] [--verbose] [-i FILE|--interfaces=FILE] [--allow CLASS] -a|IFACE...
ifquery [-nv] [--no-act] [--verbose] [-i FILE|--interfaces=FILE] [--allow CLASS] -a|IFACE...
ifquery -l|--list [-nv] [--no-act] [--verbose] [-i FILE|--interfaces=FILE] [--allow CLASS] -a|IFACE...
ifquery --state [IFACE...]
DESCRIPTIONThe ifup and ifdown commands may be used to configure (or, respectively, deconfigure) network interfaces based on interface definitions in the file /etc/network/interfaces. ifquery command may be used to parse interfaces configuration.
OPTIONSA summary of options is included below.
- -a, --all
- If given to ifup, affect all interfaces marked auto. Interfaces are brought up in the order in which they are defined in /etc/network/interfaces. Combined with --allow, acts on all interfaces of a specified class instead. If given to ifdown, affect all defined interfaces. Interfaces are brought down in the order in which they are currently listed in the state file. Only interfaces defined in /etc/network/interfaces will be brought down.
- Force configuration or deconfiguration of the interface.
- If any of the commands of scripts fails, continue.
- -h, --help
- Show summary of options.
- Only allow interfaces listed in an allow-CLASS line in /etc/network/interfaces to be acted upon.
- -i FILE, --interfaces=FILE
- Read interface definitions from FILE instead of from /etc/network/interfaces.
- -X PATTERN, --exclude=PATTERN
- Exclude interfaces from the list of interfaces to operate on by the PATTERN. PATTERN uses a usual shell glob syntax. If shell wildcards are not used, it must match the exact interface name. This option may be specified multiple times resulting in more than one pattern being excluded.
- -o OPTION=VALUE
- Set OPTION to VALUE as though it were in /etc/network/interfaces.
- -n, --no-act
- Don't configure any interfaces or run any "up" or "down" commands.
- Don't run any mappings. See interfaces(5) for more information about the mapping feature.
- Don't run any scripts under /etc/network/if-*.d/
- Disable special handling of the loopback interface. By default, the loopback interface (lo on Linux) is predefined internally as an auto interface, so it's brought up on ifup -a automatically. In the case the loopback device is redefined by user, the interface is configured just once anyway. If, however, another interface is also defined as loopback, it's configured as usual. Specifying this option disables this behaviour, so the loopback interface won't be configured automatically.
- -V, --version
- Show copyright and version information.
- -v, --verbose
- Show commands as they are executed.
- -l, --list
- For ifquery, list all the interfaces which match the specified class. If no class specified, prints all the interfaces listed as auto.
- For ifquery, dump the state of the interfaces. When no interfaces specified, lists all interfaces brought up together with logical interfaces assigned to them and exits with a status code indicating success. If one or more interfaces specified, display state of these interfaces only; successful code is returned if all of interfaces given as arguments are up. Otherwise, 0 is returned.
- ifup -a
- Bring up all the interfaces defined with auto in /etc/network/interfaces
- ifup eth0
- Bring up interface eth0
- ifup eth0=home
- Bring up interface eth0 as logical interface home
- ifdown -a
- Bring down all interfaces that are currently up.
- ifquery -l
- Print names of all interfaces specified with the auto keyword.
- ifquery -l --allow=hotplug
- Print names of all interfaces specified with the allow-hotplug keyword.
- ifquery eth0
- Display the interface options as specified in the ifupdown configuration. Each key-value pair is printed out on individual line using ": " as separator.
NOTESifup, ifdown, and ifquery are actually the same program called by different names. The program does not configure network interfaces directly; it runs low level utilities such as ip to do its dirty work. When invoked, ifdown checks if ifup is still running. In that case, SIGTERM is sent to ifup. During interface deconfiguration, ifdown ignores errors the same way as if --ignore-errors was specified.
- definitions of network interfaces See interfaces(5) for more information.
- current state of network interfaces