Network Manager

Disable resolv.conf update

To prevent NM form destroying content of resolv.conf:

[main]
...
dns=none
...

nmcli con reload

Do not touch any interfaces defined in /etc/network/interfaces

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false

Specify interfaces to ignore:

[main]
plugins=keyfile

[keyfile]
unmanaged-devices=interface-name:wlan0mon
unmanaged-devices=mac:xx:xx:xx:xx:xx:xx

nmcli con reload