Linux, Network

Enable the promiscuous mode on the physical NIC

You can put your Network Interface Controller/Card into promiscuous mode by using ifconfig.

A. To enable promiscuous mode issue the command (needs administrative rights):

ifconfig eth0 promisc

after this if you execute the command ifconfig eth0

and if everything worked as expected and your NIC supports promiscuous mode, you will notice this line:

UP BROADCAST RUNNING PROMISC MULTICAST

You have enabled the promiscuous mode!

 

B. To disable it is easy (needs administrative rights again):

ifconfig eth0 -promisc

optionally execute the command ifconfig eth0 to see this line:

UP BROADCAST RUNNING MULTICAST

which means that promiscuous mode is disabled!