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Configuring PPPoE Connections

"Extreme" base stations have two ethernet ports. One of these ports on the new base station is for the high-speed connection to you ISP which is called the WAN port. You may connect this port to a router which is connected to your high-speed internet, a hub which attached to a LAN, or directly to a cable or DSL modem. The WAN port has a symbol next to it that looks like a circle of dots.

The other ethernet port is the so-called LAN port. It has a symbol that looks like this <···>, and is meant for your internal network in case you're using the ABS as a router. So if you're planning on attaching the ABS to the cable/DSL modem and hooking up a number of desktops, this is the port you'd want to attach a hub to.

Airport Base Station Admin Utility - Internet Tab

Starting with Airport version 1.3, Apple Base Stations can act as PPP over Ethernet (PPPoE) clients. PPP over ethernet, is a means for the ISP to track who is logged in where. It is typically used in ADSL and xDSL installations and requires a user name and password to connect. Your ISP should be able to tell you if PPPoE is required to log into their high-speed network. If not, use the Ethernet method.

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