just speculation but i wonder if it is for the future use like a landline or something
yep, it may not work because it's not ready yet in the software for pass through.I had hopper & 3 joeys installed today. Tried connecting a laptop via second Ethernet, had link light but couldn't get DHCP to hand out an I IP address. I have both ports connected to my network, and connected all the joeys too. All have IP addresses and can see day passing on my net work.