Chapter 5 Broadband
P-660HN-51 User’s Guide
48
WAN IP Address
The WAN IP address is an IP address for the Zyxel Device, which makes it accessible from an outside
network. It is used by the Zyxel Device to communicate with other devices in other networks. It can be
static (fixed) or dynamically assigned by the ISP each time the Zyxel Device tries to access the Internet.
If your ISP assigns you a static WAN IP address, they should also assign you the subnet mask and DNS
server IP address(es) (and a gateway IP address if you use the Ethernet encapsulation method).
Multicast
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1 recipient) or
Broadcast (1 sender - everybody on the network). Multicast delivers IP packets to a group of hosts on
the network - not everybody and not just one.
IGMP
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish membership in a
Multicast group - it is not used to carry user data. There are three versions of IGMP. IGMP version 2 and 3
are improvements over version 1, but IGMP version 1 is still in wide use.
Finding Out More
See Section 5.3 on page 55 for technical background information on WAN.
5.1.2 Before You Begin
You need to know your Internet access settings such as encapsulation and WAN IP address. Get this
information from your ISP.
5.2 The Broadband Screen
Use this screen to change your Zyxel Device’s Internet access settings. Click Network Settings>
Broadband from the menu. The summary table shows you the configured WAN services (connections)
on the Zyxel Device.
Figure 12 Network Settings > Broadband
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