Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

While learning for my IT Security exam I wonder why PPPoE is used for establishing DSL connections instead of EAPoL?

In PPPoE, the authentication is embedded in PPP frames, which are embedded in PPPoE frames, which are embedded in Ethernet frames. As authentication protocols, PAP, CHAP or EAP is used (EAP is the best one).

EAPoL directly embedds the EAP packets in Ethernet frames and thus also provide authentication with much less overhead.

Which additional features does PPP/PPPoE provide that are needed for DSL connections? Is it related to the discovery of the network authentication server or because of the backward compatibility to PAP/CHAP ?

share|improve this question
up vote 1 down vote accepted

It boils down to timing. The IEEE 802.1X standard was first released in 2001, aDSL technology is based on late 90's standards.

share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .