"allow-hotplug bnep0" not working in Debian Jessie
 

I have the following entry in my /etc/network/interfaces file:

allow-hotplug bnep0
iface bnep0 inet static
address 10.5.0.47
netmask 255.255.0.0
broadcast 10.5.255.255

When the bnep0 interface is created, it doesn't come up automatically. It will come up manually using "ifup bnep0". There are a few tutorials where this seems to work for others in the same application (bluetooth networking).

What's the best way to troubleshoot?

I discovered I was missing /lib/udev/rules.d/80-ifupdown.rules. Installing ifupdown package resolved this issue, although it does take a while after the interface is created for it to come up with IP address.