MW1122 User Manual Copyright Nokia Networks Oy C33902002SE_0030Figure 20 Choosing the VCC2 for tunneling example4.8 Point-to-Point Protocol over Ethernet (PPPoE)Standard PPPoE mode is used when MW1122 is operating as a bridge.PPPoE protocol defines how PPP sessions are mapped into Ethernetpackets. When MW1122 operates as a bridge, this protocol istransparent to MW1122.4.9 Payload encapsulationsBoth routed and bridged protocols are encapsulated in the ATM link byusing either RFC 2684 LLC/SNAP encapsulation or VC multiplexing.MW1122 also supports PPP over AAL5 encapsulation, in whichrouted protocols are first encapsulated in PPP (RFC 1661). PPP is thenencapsulated in ATM according to the IETF PPP over AAL5 usingRFC 2364 VC multiplexing or LLC/NLPID encapsulation.4.10 Access list authorisationWhen a wireless LAN is used, it is important to be able to control theclients accessing to MW1122. Therefore, MAC-address-based accesscontrol may be used. It prevents all communications to a such clientwhose MAC address does not appear on the access list. When a newclient is brought to the network, its MAC address needs to be added to