On my laptop I have a built in wireless card and I got one external connected via usb. By ifconfig command I saw both the cards connects to internet and gets IP.
eth1 - the interface my laptop has in-built wlan1 - I have connected externally via usb.
Now I applied "sudo ifconfig eth1 down" so that i can use only wlan1. But this eth1 goes down for sometime and then come up again automatically. So I am not able to test my externally usb connected wifi adapter.
Can anyone suggest me way to disable eth1 interface?