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The stack is used to run PPP over Ethernet ( PPPoE ) , a networking standard that a number of xDSL and cable operators use today . For instance , in a broadband digital subscriber line ( DSL ) application , tunnel switching would conduct conversion of point-to-point protocol over Ethernet ( PPPoE ) subscriber sessions into layer two tunneling protocol ( L2TP ) or IP security ( IPSec ) connections to allow secure remote access to a corporate intranet . PPP over Ethernet ( PPPoE ) [ 2 ] is a protocol for establishing and encapsulating sessions between hosts and traffic aggregators ( Access Concentrators ) for PPP transport over real or emulated Ethernet . PPP over Ethernet ( PPPoE ) provides the ability to connect a network of hosts over a simple bridging access device to a remote Access Concentrator .