Hello all,
My usb0 interface has suddenly stopped working and will not start properly.
Things were working well but after a power-off and reboot via SW2, usb0 no 
longer comes up.
Luckily I have a serial port adapter attached to the BBB J1. Otherwise I 
would be dead since I can no longer ssh into BBB from the host pc.

I am running the latest Debian image on a BBB with this kernel:

Linux beaglebone 4.4.52-bone16 #1 Tue Feb 28 06:56:05 UTC 2017 armv7l 
GNU/Linux

ifconfig usb shows:
usb0      Link encap:Ethernet  HWaddr d0:5f:b8:d2:78:b6
          inet addr:192.168.7.2  Bcast:192.168.7.3  Mask:255.255.255.252
          inet6 addr: fe80::d25f:b8ff:fed2:78b6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Note that there are NO RX/TX packets. This is the first clue.

/etc/network/interfaces contains:

# Ethernet/RNDIS gadget (g_ether)
# Used by: /opt/scripts/boot/autoconfigure_usb0.sh
auto usb0
iface usb0 inet static
    address 192.168.7.2
    netmask 255.255.255.252
    network 192.168.7.0
    gateway 192.168.7.1


Taking usb0 down gets:

debian@beaglebone:~$ sudo ifdown usb0
ifdown: interface usb0 not configured

Restarting networking gets:

debian@beaglebone:~$ sudo /etc/init.d/networking restart
Restarting networking (via systemctl): networking.serviceJob for 
networking.service failed because the control process exited with error 
code.
See "systemctl status networking.service" and "journalctl -xe" for details.
 failed!

and systemctl status networking.service shows:

debian@beaglebone:~$ systemctl status networking.service
● networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor 
prese
  Drop-In: /run/systemd/generator/networking.service.d
           └─50-insserv.conf-$network.conf
   Active: failed (Result: exit-code) since Sat 2016-05-21 19:12:46 EDT; 
35s ago
     Docs: man:interfaces(5)
 Main PID: 1910 (code=exited, status=1/FAILURE)

May 21 19:12:44 beaglebone systemd[1]: Starting Raise network interfaces...
May 21 19:12:45 beaglebone ifup[1910]: RTNETLINK answers: File exists
May 21 19:12:45 beaglebone ifup[1910]: Failed to bring up usb0.
May 21 19:12:46 beaglebone systemd[1]: networking.service: Main process 
exited,
May 21 19:12:46 beaglebone systemd[1]: Failed to start Raise network 
interfaces.
May 21 19:12:46 beaglebone systemd[1]: networking.service: Unit entered 
failed s
May 21 19:12:46 beaglebone systemd[1]: networking.service: Failed with 
result 'e
lines 1-15/15 (END)

The message "*Failed to start Raise network interfaces*" is seen as boot 
messages scroll by on the console.

Any help would be greatly appreciated!!!
Mike Davis

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