Pppoa; Pppoe; Mer; Ipoa - ZyXEL Communications P-663H-51 User Manual

Chapter 5 WAN Setup

5.5.1 PPPoA

PPPoA stands for Point to Point Protocol over ATM Adaptation Layer 5 (AAL5). A PPPoA
connection functions like a dial-up Internet connection. The ZyXEL Device encapsulates the
PPP session based on RFC1483 and sends it through an ATM PVC (Permanent Virtual
Circuit) to the Internet Service Provider's (ISP) DSLAM (digital access multiplexer). Please
refer to RFC 2364 for more information on PPPoA. Refer to RFC 1661 for more information
on PPP.

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.
56
P-663H-51 User's Guide