and this:
root@zynthian:/etc/network# cat interfaces
auto lo
iface lo inet loopback
allow-hotplug eth0
iface eth0 inet dhcp
allow-hotplug eth1
iface eth1 inet dhcp
allow-hotplug wlan0
iface wlan0 inet dhcp
allow-hotplug wlan1
iface wlan1 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf