It is advised not to use static IP addresses or DHCP on the same interfaces as PPPoE for obvious security reasons. Generally speaking, PPPoE is used to hand out IP addresses to clients based on authentication by username (and also if required, by workstation) as opposed to workstation only authentication where static IP addresses or DHCP are used. The difference between them is expressed in transport method: PPPoE employs Ethernet instead of serial modem connection. PPPoE is an extension of the standard Point to Point Protocol (PPP). Currently PPPoE is used mainly by ISPs to control client connections for xDSL and cable modems as well as plain Ethernet networks. The PPPoE (Point to Point Protocol over Ethernet) protocol provides extensive user management, network management and accounting benefits to ISPs and network administrators. 8.1 PPPoE in a multipoint wireless 802.11g network.6 PPPoE Server Setup (Access Concentrator).
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