When you are setting up a new WiFi router or modem, you may encounter an internet option called PPPoE. Unlike connecting your router to a modem and letting it obtain an IP address automatically, PPPoE requires a specific username and password supplied by your internet service provider (ISP) so your router can connect to the internet.
PPPoE stands for Point-to-Point Protocol over Ethernet and is a networking protocol technology being used mostly by internet service providers so they can establish and manage a subscriber connection over an Ethernet network.
For many home broadband connections, ISPs use PPPoE, and it works behind the scenes. Your router is the primary device that handles the PPPoE login, establishes the connection with the ISP, receives the necessary network configuration to access the internet, and then shares the internet connection with all of the connected devices over WiFi and through Ethernet.
If you are installing a new router, replacing ISP-provided equipment, troubleshooting an internet connection, or configuring a broadband connection manually, understanding PPPoE can be helpful.
What is PPPoE?
PPPoE is a networking protocol that is a combination of two technologies:
- PPP: Point-to-Point Protocol
- Ethernet: a common networking technology used for wired networks
PPP technology was originally designed to establish point-to-point connections and provide mechanisms such as authentication and connection management. PPPoE is a refined version of this technology, which adapts the basic concept of PPP while involving Ethernet networks.
In a typical home setup, the ISP provides PPPoE credentials to establish a connection to the internet network and access it. You either enter those credentials into your router or the technician does it for you, and the router uses them to establish a session with the ISP. Once credentials are authenticated, the ISP can provide the router with an IP address and other network parameters needed to establish internet access.
How Does PPPoE Work?
The process of PPPoE may look and sound complicated, but the basic idea is straightforward.
Imagine that your WiFi router is connected to an ISP’s network through an Ethernet cable. The WiFi router first needs to discover the appropriate PPPoE access server. It then establishes a PPPoE session and authenticates the session using the credentials provided by the ISP.
Once authentication is successful, the ISP can provide the router with the network configuration required to access the internet.
To simplify, the entire process:
Router > PPPoE discovery > ISP access server > Authentication > PPP session > IP configuration > Internet access
Your connected devices then use the WiFi router as their gateway to access the internet.
Why Do ISPs Use PPPoE?
Many ISPs around the world use PPPoE to identify and authenticate individual subscribers. Instead of allowing any device connected to a physical connection to access the internet, ISPs require devices to use a PPPoE username and password. This gives the ISPs a mechanism to associate a connection with a particular subscriber account and provide them internet access.
PPPoE can also be used for:
- User authentication
- Session establishment
- Session termination
- Connection management
- Assigning IP configuration
- Accounting and subscriber management
The exact implementation of PPPoE varies between ISPs
What Is a PPPoE Username?
A PPPoE username is an identifier associated with your broadband account. Each subscriber has a unique PPPoE username and is supplied by the ISP. Your PPPoE username might not be the same as your email address or customer account username.For this reason, it is best to ask for the username from the ISP and copy it exactly as provided rather than guessing its format.
What Happens If the PPPoE Credentials are Wrong?
The PPPoE credentials are provided by your ISP according to your broadband account. If the username or password is incorrect, the router may be unable to authenticate with the ISP, and you might see a status such as:
- Authentication failed
- PPPoE disconnected
- Connecting
- Username/password incorrect
- WAN disconnected
Before you change your router, change advanced network settings, or reset the router, verify that the PPPoE credentials are correct. If required, contact your ISP and ask them to confirm or reset the credentials.