ifup - bring a network interface up
ifdown - take a network interface down
ifup [-sinv? [--interfaces=__''file''__? [--no-act?
ifdown [-sinv? [--interfaces=__''file''__?
The ifup and ifdown commands may be used to
configure (or, respectively, deconfigure) network
interfaces, based on descriptions of the interfaces entered
into the file /etc/network/interfaces.
These programs follow the usual GNU command line syntax,
with long options starting with two dashes (`-'). A summary
of options is included below.
Show summary of options.
Show copyright and version information.
Affect all interfaces marked auto.
-i file, --interfaces file
Read interface definitions from a different
Show commands being executed.
Don't actually execute the commands (this doesn't disable
Don't run any mappings.
Force de/configuration of interface.
The ifup and ifdown programs don't actually
know anything about configuring interfaces themselves but
instead invoke lower-level utilities such as ifconfig
and route to do the actual dirtywork. The main
advantages to using ifup and ifdown instead of
calling the lower-level utilities directy is the ability to
keep all your interface specifications in a single (easily
parsable) file, and to not have to deal with the various
idiosyncracies of the lower-level commands.
Descriptions of all the network interfaces the system
Current state of network interfaces.
The ifupdown suite written by Anthony Towns