User's Manual

Chapter 5 WAN Setup
P-663HN-51 User’s Guide
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5.5.2 PPPoE
PPPoE (Point to Point Protocol over Ethernet) provides access control and billing
functionality in a manner similar to dial-up services using PPP. The ZyXEL Device
bridges a PPP session over Ethernet (PPP over Ethernet, RFC 2516) from your
computer to an ATM PVC (Permanent Virtual Circuit) which connects to ADSL
Access Concentrator where the PPP session terminates. One PVC can support any
number of PPP sessions from your LAN. For more information on PPPoE, see the
appendices.
5.5.3 MER
MER (MAC Encapsulated Routing) is only implemented with the IP network
protocol. IP packets are routed between the Ethernet interface and the WAN
interface and then formatted so that they can be understood in a bridged
environment. For instance, it encapsulates routed Ethernet frames into bridged
ATM cells.
5.5.4 IPoA
IPoA (Internet Protocol over ATM) in RFC 1483 describes two methods for
Multiprotocol Encapsulation over ATM Adaptation Layer 5 (AAL5). The first method
allows multiplexing of multiple protocols over a single ATM virtual circuit (LLC-
based multiplexing) and the second method assumes that each protocol is carried
over a separate ATM virtual circuit (VC-based multiplexing). Please refer to the
RFC for more detailed information.
5.5.5 Bridging
With bridging the ZyXEL Device has a static IP address for the connection. The
ZyXEL Device passes traffic through to another device (a computer or router for
example) that handles authenticating with the ISP.
5.6 Encapsulation
There are two conventions to identify what protocols the virtual circuit (VC) is
carrying. Be sure to use the encapsulation method required by your ISP.