ZyXEL Communications Corporation P660HNT1AV2 Manuel D’Utilisation

 Chapter 5 Broadband

P-660HN-Tx(A) v2 User’s Guide

This section provides some technical background information about the topics covered in this 
chapter.

Be sure to use the encapsulation method required by your ISP. The ADSL Router supports the 
following methods.

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. For instance, it 
encapsulates routed Ethernet frames into bridged ATM cells. ENET ENCAP requires that you specify 
a gateway IP address in the Gateway IP Address field in the wizard or WAN screen. You can get 
this information from your ISP.

The ADSL Router supports PPPoE (Point-to-Point Protocol over Ethernet). PPPoE is an IETF Draft 
standard (RFC 2516) specifying how a personal computer (PC) interacts with a broadband modem 
(DSL, cable, wireless, etc.) connection. The PPPoE option is for a dial-up connection using PPPoE.

For the service provider, PPPoE offers an access and authentication method that works with existing 
access control systems (for example RADIUS).

One of the benefits of PPPoE is the ability to let you access one of multiple network services, a 
function known as dynamic service selection. This enables the service provider to easily create and 
offer new IP services for individuals.

Operationally, PPPoE saves significant effort for both you and the ISP or carrier, as it requires no 
specific configuration of the broadband modem at the customer site.

By implementing PPPoE directly on the ADSL Router (rather than individual computers), the 
computers on the LAN do not need PPPoE software installed, since the ADSL Router does that part 
of the task. Furthermore, with NAT, all of the LANs’ computers will have access.

MTU

The Maximum Transmission Unit (MTU) defines the size of the largest packet allowed on an 
interface or connection. Enter the MTU in this field.

For ENET ENCAP, the MTU value is 1500.

For PPPoE, the MTU value is 1492.

For PPPoA and RFC, the MTU is 100-1500.

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Network Setting > Broadband > More Connections: Edit: Advanced Setup (continued)