ZyXEL Communications ZyWALL5UTM 4.0 User Manual

ZyWALL 5/35/70 Series User’s Guide

Chapter 7 WAN Screens

142

The ZyWALL supports PPPoE (Point-to-Point Protocol over Ethernet). PPPoE is an IETF 
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.

 

 

RIP Version

The RIP Version field controls the format and the broadcasting method of the RIP 

packets that the ZyWALL sends (it recognizes both formats when receiving). 

Choose RIP-1, RIP-2B or RIP-2M.

RIP-1 is universally supported; but RIP-2 carries more information. RIP-1 is 

probably adequate for most networks, unless you have an unusual network 

topology. Both RIP-2B and RIP-2M sends the routing data in RIP-2 format; the 

difference being that RIP-2B uses subnet broadcasting while RIP-2M uses 

multicasting. Multicasting can reduce the load on non-router machines since they 

generally do not listen to the RIP multicast address and so will not receive the RIP 

packets. However, if one router uses multicasting, then all routers on your network 

must use multicasting, also. By default, the RIP Version field is set to RIP-1.

Enable Multicast

Select this check box to turn on IGMP (Internet Group Multicast Protocol). IGMP is 

a network-layer protocol used to establish membership in a Multicast group - it is 

not used to carry user data.

Multicast Version

Choose None (default), IGMP-V1 or IGMP-V2. IGMP (Internet Group Multicast 

Protocol) is a session-layer protocol used to establish membership in a Multicast 

group – it is not used to carry user data. IGMP version 2 (RFC 2236) is an 

improvement over version 1 (RFC 1112) but IGMP version 1 is still in wide use. If 

you would like to read more detailed information about interoperability between 

IGMP version 2 and version 1, please see sections 4 and 5 of RFC 2236.

Spoof WAN MAC 

Address

You can use the factory assigned default MAC Address or cloning the MAC 

address from a computer on your LAN. 
Otherwise, select the check box next to Spoof WAN MAC Address and enter the 

IP address of the computer on the LAN whose MAC you are cloning. Once it is 

successfully configured, the address will be copied to the rom file (ZyNOS 

configuration file). It will not change unless you change the setting or upload a 

different ROM file. 

Clone the 

computer’s MAC 

address – IP 

Address

Enter the IP address of the computer on the LAN whose MAC you are cloning.
It is recommended that you clone the MAC address prior to hooking up the WAN 

port.

Apply

Click Apply to save your changes back to the ZyWALL.

Reset

Click Reset to begin configuring this screen afresh.

Table 39   WAN: Ethernet Encapsulation (continued)