Note: It is a recommended best practice to utilize inspection bypass rules to bypass encrypted traffic. This is recommended because the IPS cannot inspect encrypted traffic and attempting to do so can impact performance and cause unnecessary CPU processing load.
The Point-to-Point Protocol over Ethernet (PPPoE) is a network protocol for encapsulating PPP frames inside Ethernet frames. It appeared shortly after the year 2000, in the context of the boom of the DSL as the solution for tunneling packets over the DSL connection to the ISP's IP network, and from there to the rest of the Internet. PPPoE provides authentication, encryption, and compression. Typical use of PPPoE involves leveraging the PPP facilities for authenticating the user with a username and password, predominately via the PAP protocol and less often via CHAP. PPPoE was developed by UUNET, Redback Networks (now Ericsson) and RouterWare (now Wind River Systems) and is available as an informational RFC 2516.