Hi,
The current script in debian 8.0 uses dnsmasq to serve dhcp. Current config 
for dnsmasq does not bind to usb0 , so it uses the lo device. In case I add 
a new network device and want to use another instance of dnsmasq to serve 
dhcp on that device, I can't as the current config, blocks a second dnsmasq 
as the socket is already in use. This is because the first dnsmasq runs on 
0.0.0.0 and serves all network devices.

This also blocks running avahi-dnsconfd, as the lo device is taken. avahi 
is useful, for when you don't know the address of your BBB, and can reach 
it using the hostname beagleone.local.

so I suggest this dnsmasq config:

/etc/dnsmasq.d/usb0-dhcp
#disable DNS by setting port to 0
port=0

interface=usb0

#one address range
dhcp-range=192.168.7.1,192.168.7.1

dhcp-option=3
except-interface=lo
listen-address=192.168.7.2
bind-interfaces

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