ZyXEL Communications EMG5324-D10A ユーザーズマニュアル

 Chapter 5 Broadband

EMG5324-D10A User’s Guide

The following section contains additional technical information about the Device features described 
in this chapter.

Be sure to use the encapsulation method required by your ISP. The Device can work in bridge mode 
or routing mode. When the Device is in routing mode, it supports the following methods.

IP over Ethernet (IPoE) is an alternative to PPPoE. IP packets are being delivered across an 
Ethernet network, without using PPP encapsulation. They 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 Ethernet cells. 

Point-to-Point Protocol over Ethernet (PPPoE) provides access control and billing functionality in a 
manner similar to dial-up services using PPP. PPPoE is an IETF standard (RFC 2516) specifying how 
a personal computer (PC) interacts with a broadband modem (DSL, cable, wireless, etc.) 
connection. 

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

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 default gateway.

A Virtual Local Area Network (VLAN) allows a physical network to be partitioned into multiple logical 
networks. Devices on a logical network belong to one group. A device can belong to more than one 
group. With VLAN, a device cannot directly talk to or hear from devices that are not in the same 
group(s); the traffic must first go through a router.