2 airport extremes, one extends the main network but doesn't provide internet over wired ethernet connection I have 2 apple airport extreme base stations, one is wired in to the modem the other is setup to extend the network of the first.

I want to be able to plug computer into via ethernet into the airport set up as the extender, but it doesn’t read any internet connection.

Any ideas? 

For context both base stations are configured with the same SSID and password

The 2nd extreme is not currently in bridge mode, (I tried that but no dice) and in airport utility on the "Wireless" tab I have "Network Mode" set to "Extend a wireless network"

When I have that option selected the "Network" tab in airport utility is completely grayed out.
I do this all the time. 


Connect any of the normal Ethernet from the main station to the source Ethernet on the second station. 
Set the second to bridge mode
Have each broadcast the same network, don’t extend, just set up the same or different SSID / network names to suit your preferences. 


Having both create a wireless network works best for me. Until such point you get newer hardware like UniFi Dream Machine (or pro) or perhaps another ubiquiti line or like product.