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Recipe 3.1 Listing Your Network Interfaces
3.1.1 Problem
You want a list of your network
interfaces.
3.1.2 Solution
To list all interfaces, whether up or down, whose drivers are loaded:
$ ifconfig -a
To list all interfaces that are up:
$ ifconfig
To list a single interface, commonly eth0:
$ ifconfig eth0
3.1.3 Discussion
If you are not root, ifconfig might not be in your
path: try /sbin/ifconfig.When invoked with the -a option,
ifconfig lists all network interfaces that are up
or down, but it will miss physical interfaces whose drivers are not
loaded. For example, suppose you have a box with two
Ethernet cards installed
(eth0 and eth1) from
different manufacturers, with different drivers, but only one
(eth0) is configured in Linux (i.e., there is an
/etc/sysconfig/network-scripts/ifcfg-* file for
it). The other interface you don't normally use.
ifconfig -a will not show the second interface
until you run ifconfig eth1 to load the driver.
3.1.4 See Also
ifconfig(8).
