Can't share Internet from Mac to AirPort Extreme via Thunderbolt Ethernet

Question

Hey there!
I'm trying to essentially use a 2013 AirPort Extreme as an AP for the network. It's connected via WAN to a Mac via a Thunderbolt to Ethernet adapter.
I'm having a hard time telling OS X (10.10)/ OS X Server that I want it to take the Internet from "iPhone USB" and share it with "Thunderbolt Ethernet". With or without OS X Server's DHCP/DNS "help". I've been experiencing issues with Internet Sharing for years on OS X, so the fact that I'm having an issue today is no surprise, I'm just hoping someone out there has a solution.
If I go back to Internet Sharing in System Preferences, the "share Internet connection from" combo box is blank, rather than showing "iPhone USB".
Also, I'm unsure as to whether I should be using OS X Server... I know it's not necessary for simple Internet connection sharing, but I'd like to use DHCP and DNS services with this setup at least eventually.... Obviously just getting Internet to the AirPort is first-priority.
Any ideas?

Answer 1

Hello Kevin,
Let me try to get this straight, it seems like you want to bridge the fee-based wifi network and your home wireless network using your MB.
I don't know if you have done the following steps already on your MB:
1) Choose Apple > System Preferences, and then click Sharing.
2) Select Internet Sharing.
3) Choose a network service from the “Share your connection from” pop-up menu, AirPort in your case.
4) Select a networking service to share your Internet connection from the “To computers using” list, ethernet in your case.
Sorry, yes indeed it is straight from Mac Help titled "Sharing your Internet connection." and it sounds like you have done the sharing part already. You wrote about something wrong with your MB. It might be helpful to write what is wrong with your MB, AirPort Extreme, or your "other computers." Preciseness can definably help us help you.
May you solve the problem.