MacBook connected to ghost network

It was probably there before Yosemite but you did not see it.

Usually when your Internet service provider requires it it will be used.

PPPoE stands for Point-to-Point Protocol over Ethernet. PPPoE has become a favorite technology of broadband Internet service providers, who use it to save time and money. DSL and cable modem subscribers, on the other hand, have reason to be less enthusiastic about PPPoE.

PPPoE Client Overview

PPPoE combines two widely accepted standards, Ethernet and PPP, to provide an authenticated method of assigning IP addresses to client systems. PPPoE clients are typically personal computers connected to an ISP over a remote broadband connection, such as DSL or cable service. ISPs deploy PPPoE because it supports high-speed broadband access using their existing remote access infrastructure and because it is easier for customers to use.

PPPoE provides a standard method of employing the authentication methods of the Point-to-Point Protocol (PPP) over an Ethernet network. When used by ISPs, PPPoE allows authenticated assignment of IP addresses. In this type of implementation, the PPPoE client and server are interconnected by Layer 2 bridging protocols running over a DSL or other broadband connection.

You can set up a new PPPoE or check the current set up.

The problem was I didn't have DCHP enabled on the Airport, but when I did, the internet wouldn't work at all on all devices, when with it disabled, it worked on some.

So I contacted both my ISP (Bell/2Wire) and Apple. I had to setup the Airport to use PPPoE and I received that information over a call with my ISP.

The quickest route was to just reset both, call my ISP for PPPoE and reconfigure both.