pod is mostly correct in post #3.
However, it does depend on the local office of the ISP (Comcast, in this case).
I can get an IP from the ethernet of the router and a different IP from the USB port. I can connect to each port at the same time (from 2 different computers). I have Comcast.
However, Comcast does not support this in every market. Some areas yes, and some areas no. In some cities, only one port of the modem can be active at any given time. Thus, if the ethernet gets an IP address first, the USB port is automatically disabled. If the USB gets an IP address first, the ethernet is automatically disabled. A modem reboot would be required when switching ports is desired.
So, test your modem and find out. It may work and it may not. Modem hardware can handle it, but the ISP programs what features are enabled or disabled. The features vary from city to city (even if the provider is the same).
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