Linux and Unix ifup and ifdown command
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About ifup and ifdown
Syntax
Examples
Related commands
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ifup - bring a network interface up
ifdown - take a network interface down
ifup [-nv] [--no-act] [--verbose] [-i FILE|--interfaces=FILE] [--allow CLASS] -a|IFACE...
ifup -h|--help
ifup -V|--version
ifdown [-nv] [--no-act] [--verbose] [-i FILE|--interfaces=FILE] [--allow CLASS] -a|IFACE...
| -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, --version | Show copyright and version information. |
| -v, --verbose | Show commands as they are executed. |
ifup -a
Bring up all the interfaces defined with auto in /etc/network/interfaces
ifup eth0
Bring up interface eth0
ifdown -a
Bring down all interfaces that are currently up.