select interface.

**Is your feature request related to a problem? Please describe.**
No... no real problem. I just turn off wifi, then scan the ethernet.
then forget to turn wifi back on.

**Describe the solution you'd like**
An option to select interfaces to do the scanning on.
like eth0, or wlan0 or whatever

**Describe alternatives you've considered**
I just disable the thing I don't want to scan, when I'm scanning.

**Additional context**
Just a request. If its already present, and I missed it, my apologies.

Linux and windows user.