User's Manual

Chapter 6 WAN Setup

AMG1202-T10A User’s Guide

6.4 WAN Technical Reference

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

chapter.

6.4.1 Encapsulation

Be sure to use the encapsulation method required by your ISP. The ZyXEL Device supports the

following methods.

6.4.1.1 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. 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.

6.4.1.2 PPP over Ethernet

The ZyXEL Device 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.

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 65535.

Back Click this to return to the previous screen without saving.

Apply Click this to save your changes.

Cancel Click this to restore your previously saved settings.

Table 20 Network > WAN > More Connections: Edit: Advanced Setup (continued)

LABEL DESCRIPTION