I cannot do that since one is an RJ45 cable and the other a USB cable that is connected to my local PC.
I have configured the l4tbr0 to see my PC as a gateway and I am able to access the internet through this configuration. Only when I make this configuration does the usb0 and rndis0 devices show up in ifconfig.
Please see this thread Xavier - USB network configuration - #7 by michael.c.proicou