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Page 71 / 300 Scroll up to view Page 66 - 70
Chapter 5 WAN Setup
P-663HN-51 User’s Guide
71
Multicast delivers IP packets to a group of hosts on the network - not everybody
and not just 1.
IGMP (Internet Group Management Protocol) is a network-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. The class D IP address is used to identify host groups and
can be in the range 224.0.0.0 to 239.255.255.255. The address 224.0.0.0 is not
assigned to any group and is used by IP multicast computers. The address
224.0.0.1 is used for query messages and is assigned to the permanent group of
all IP hosts (including gateways). All hosts must join the 224.0.0.1 group in order
to participate in IGMP. The address 224.0.0.2 is assigned to the multicast routers
group.
The ZyXEL Device supports both IGMP version 1 (
IGMP-v1
) and IGMP version 2
(
IGMP-v2
). At start up, the ZyXEL Device queries all directly connected networks
to gather group membership. After that, the ZyXEL Device periodically updates
this information. IP multicasting can be enabled/disabled on the ZyXEL Device LAN
and/or WAN interfaces in the web configurator (
LAN
;
WAN
). Select
None
to
disable IP multicasting on these interfaces.
Page 72 / 300
Chapter 5 WAN Setup
P-663HN-51 User’s Guide
72
5.16
NAT, IGMP Multicast, and WAN Service
This is the fourth WAN screen to display for every connection type except bridging
(for which this is the third screen). This screen varies depending on the connection
type. Use this screen to configure NAT, IGMP multicast, and WAN service settings.
Figure 30
Advanced Setup > WAN > Add (4: MER)
The following table describes the labels in this screen.
Table 20
Advanced Setup > WAN > Add (4: MER)
LABEL
DESCRIPTION
Enable NAT
Turn on NAT to translate IP addresses between two different networks
(so you can have a private LAN with IP addresses that are different
from the public IP addresses on the WAN. See
Chapter 7 on page 83
for more details.
Enable
Fullcone NAT
This field displays when you enable NAT. In full cone NAT, all requests
from the same private IP address and port are mapped to the same
public source IP address and port. Someone on the Internet only
needs to know the mapping scheme in order to send packets to a
device behind the ZyXEL Device.
The ZyXEL Device uses restricted cone NAT when you disable full cone
NAT.
Enable Firewall
Select this to turn on the ZyXEL Device’s Stateful Packet Inspection
(SPI) firewall. By default the firewall blocks traffic originating from the
WAN from going to the LAN. See
Chapter 8 on page 93
for how to
configure firewall rules.
Enable IGMP
Multicast
IGMP (Internet Group Management Protocol) is a network-layer
protocol used to establish membership in a Multicast group - it is not
used to carry user data. Turn this on to allow multicast traffic and
have the ZyXEL Device act as an IGMP proxy.
Enable WAN
Service
Select this option to use this WAN connection or clear the option to
not use this WAN connection.
Page 73 / 300
Chapter 5 WAN Setup
P-663HN-51 User’s Guide
73
5.17
WAN Setup Summary
This is the last WAN setup screen to display. Use this screen to check your settings
before saving them. Click
Back
if you need to make any changes. If the settings
are OK, click
Save
to save the settings. Use the
Save/Reboot
button in the
Advanced Setup > WAN
screen to restart the ZyXEL Device and use the WAN
connection settings.
Figure 31
Advanced Setup > WAN > Add (Summary: MER)
Service Name
This is the name for the WAN connection. Use the default or define
your own.
Back
Click this to return to the previous screen.
Next
Click this to go to the following screen.
Table 20
Advanced Setup > WAN > Add (4: MER) (continued)
LABEL
DESCRIPTION
Page 74 / 300
Chapter 5 WAN Setup
P-663HN-51 User’s Guide
74
Page 75 / 300
P-663HN-51 User’s Guide
75
C
HAPTER
6
LAN Setup
This chapter describes how to configure LAN settings.
6.1
LAN Overview
A Local Area Network (LAN) is a shared communication system to which many
computers are attached. A LAN is a computer network limited to the immediate
area, usually the same building or floor of a building. The LAN screens can help
you configure a LAN DHCP server and manage IP addresses.
See
Section 6.5 on page 80
to configure the
LAN
screens.
6.1.1
LAN, WAN and the ZyXEL Device
The actual physical connection determines whether the ZyXEL Device ports are
LAN or WAN ports. There are two separate IP networks, one inside the LAN
network and the other outside the WAN network as shown next.
Figure 32
LAN and WAN IP Addresses

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