Bizarre BBB LAN USB Host problem


It seems the USB connection from my BBB to my Ubuntu host trashes my host 
internet connection.


Ubuntu uname -a

Linux ubuntu1 3.16.0-44-generic #59~14.04.1-Ubuntu SMP …


BBB uname -a

Linux beaglebone 3.8.13-bone79 #1 SMP ...


Network configuration:

Cable modem (192.168.100.1) connected to:

Router (192.168.1.1) connected to:

Ubuntu host (192.168.1.10)

and

BBB (192.168.1.15)


BBB (192.168.7.2) is also connected to host (192.168.7.1) via USB and Putty.


On initial startup, everything seems to work fine. I have full terminal 
access from my host to the BBB via Putty. I can ping both my router and my 
modem from both the BBB terminal and a terminal window in my host. I can 
access the internet with my host browser.


When I restart or reboot the BBB with the USB cable connected to the host, 
I can still connect to my BBB with Putty on the host. I can also ping both 
my router and modem from the BBB. 


HOWEVER, I cannot ping either the router or the modem from my host 
terminal. 

BUT, if I reboot the BBB again, my host can now ping the router, but not 
the cable modem. 

AND the BBB can ping both the router and the modem.


This condition is maintained no matter how I reset, power on/off, or just 
plain disconnect the BBB from everything. Until I reboot my host computer, 
I cannot ping (or browse to) the modem (or internet), but I can ping and 
browse to my router.


With the BBB powered and connected to the router, but not the host USB, it 
has no effect on how my host connects to the modem and internet.


How is the BBB USB connection to my host computer causing my host computer 
to not connect to the cable modem even though my host connects to the 
router? And why does it only happen after I reset the BBB when it is 
connected to my host via USB?


More importantly, how might one fix it, please?


Thank you for your time and consideration.


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