Hello, I am a newbie trying to use two Beaglebone Black boards within the 
same lan network, and am having problems. Connecting them to PC with usb 
cable works fine, and I can connect to *beaglebone.local* fine with putty, 
and access built-in IDEs through web browser on windows.

The problems arise when I try to turn them on while powered by 5V cable, 
without usb. The Ethernet cable to my network is plugged before boot, and 
lights turn on as expected. But it appears the board does not broadcast 
into the network, and cannot be connected to with ssh. I tried setting up a 
static 
ip address 
<https://www.ofitselfso.com/Beagle/NetworkingSetupConnectingTheBeagleboneBlack.php>
 
when it was connected through usb, but it doesn't seem to help, putty 
connection timeouts on direct IP connection, and cannot find* 
beaglebone.local* hosts in the network. The weirdest thing is that the 
ethernet connection worked fine a few weeks ago, this problem started only 
recently.

I am booting the boards from an sd card with debian-9.9-iot image. What 
could be the cause of this? Is there a solution that isn't updating the 
image? Are the usb server and ethernet server on BBB different systems?

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