How do I find what kernel module is behind a network interface?

Question

How do I find out what kernel module is used for any given network interface?

Answer 1

On the command line run

sudo lshw -C network 

For every network interface you'll get a section starting with *-network. Every section hast a logical name: line that contains the interface name and a configuration: line that contain the driver and some other information.

Answer 2

You can query sysfs to tell you this information. To tell which driver a network interface is using:

ls -l /sys/class/net/<devname>/device/driver

... where <devname> is something like eth0. This driver directory will be a symlink to the driver node in sysfs.

To get the name of the module that provides that driver:

ls -l /sys/class/net/<devname>/device/driver/module

... and this module directory will be a symlink to the module node in sysfs.