Bring a network interface up or down
Syntax
ifup [options] -a | IFACE...
ifdown [options] -a|IFACE...
Options
-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.
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 Force configuration or deconfiguration of the interface.
--allow=CLASS 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.
-n, --no-act Don't configure any interfaces or run any "up" or "down" commands.
--no-mappings Don't run any mappings. See interfaces for more information about the mapping feature.
-v, --verbose Show commands as they are executed.
-h, --help Display help for ifup
-V, --version Show copyright and version information.
Examples
Bring up all the interfaces defined with auto in /etc/network/interfaces
ifup -a
Bring up interface eth0
ifup eth0
Bring down all interfaces that are currently up.
ifdown -a
"Either I'm dead or my watch has stopped" ~ Groucho Marx's last words
Related linux commands:
ifplugd - A link detection daemon for ethernet devices.
logout - Exit a login shell.