ZyXEL Communications Prestige 642R Series - Manual (Page 53)

Prestige 642R Series ADSL Router
3-10 Internet Access
3.11.1 ENET ENCAP
The MAC Encapsulated Routing Link Protocol (ENET ENCAP) 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 i.e., it encapsulates routed Ethernet frames into bridged
ATM cells. ENET ENCAP requires that you specify a gateway IP address in the Ethernet Encapsulation
Gateway field in Menu 4 and in the Rem IP Addr field in Menu 11.1. You can get this information from
your ISP.
3.11.2 PPP over Ethernet
PPPoE provides access control and billing functionality in a manner similar to dial-up services using PPP.
The Prestige bridges a PPP session over Ethernet (PPP over Ethernet, RFC 2516) from your PC to an ATM
PVC (Permanent Virtual Circuit) which connects to a xDSL 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.
3.11.3 PPP
Please refer to RFC 2364 for more information on PPP over ATM Adaptation Layer 5 (AAL5). Refer to RFC
1661 for more information on PPP.
3.11.4 RFC 1483
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.
3.12 IP Address Assignment
A static IP is a fixed IP that your ISP gives you. A dynamic IP is not fixed; the ISP assigns you a different
one each time. The Single User Account feature can be enabled or disabled if you have either a dynamic or
static IP. However the encapsulation method assigned influences your choices for IP Address and ENET
ENCAP Gateway.
3.12.1 Using PPP or PPPoE Encapsulation
If you have a dynamic IP, then the IP Address and ENET ENCAP Gateway fields are not applicable (N/A). If
you have a static IP, then you only need to fill in the IP Address field and not the ENET ENCAP Gateway
field.
3.12.2 Using RFC 1483 Encapsulation
In this case the IP Address Assignment must be static with the same requirements for the IP Address and
ENET ENCAP Gateway fields as stated above.