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Chapter 4 Broadband
eircom F1000 Modem User’s Guide
66
Multicast
IP packets are transmitted in either one of 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 1.
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. 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.
At start up, the Device queries all directly connected networks to gather group membership. After
that, the Device periodically updates this information.
DNS Server Address Assignment
Use Domain Name System (DNS) to map a domain name to its corresponding IP address and vice
versa, for instance, the IP address of www.zyxel.com is 204.217.0.2. The DNS server is extremely
important because without it, you must know the IP address of a computer before you can access
it.
The Device can get the DNS server addresses in the following ways.
1
The ISP tells you the DNS server addresses, usually in the form of an information sheet, when you
sign up. If your ISP gives you DNS server addresses, manually enter them in the DNS server fields.
2
If your ISP dynamically assigns the DNS server IP addresses (along with the Device’s WAN IP
address), set the DNS server fields to get the DNS server address from the ISP.
IPv6 Addressing
The 128-bit IPv6 address is written as eight 16-bit hexadecimal blocks separated by colons (:). This
is an example IPv6 address
2001:0db8:1a2b:0015:0000:0000:1a2f:0000
.
IPv6 addresses can be abbreviated in two ways:
•
Leading zeros in a block can be omitted. So
2001:0db8:1a2b:0015:0000:0000:1a2f:0000
can
be written as
2001:db8:1a2b:15:0:0:1a2f:0
.
•
Any number of consecutive blocks of zeros can be replaced by a double colon. A double colon can
only appear once in an IPv6 address. So
2001:0db8:0000:0000:1a2f:0000:0000:0015
can be
written as
2001:0db8::1a2f:0000:0000:0015
,
2001:0db8:0000:0000:1a2f::0015
,
2001:db8::1a2f:0:0:15
or
2001:db8:0:0:1a2f::15
.
IPv6 Prefix and Prefix Length
Similar to an IPv4 subnet mask, IPv6 uses an address prefix to represent the network address. An
IPv6 prefix length specifies how many most significant bits (start from the left) in the address
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Chapter 4 Broadband
eircom F1000 Modem User’s Guide
67
compose the network address. The prefix length is written as “/x” where x is a number. For
example,
2001:db8:1a2b:15::1a2f:0/32
means that the first 32 bits (
2001:db8
) is the subnet prefix.
Page 68 / 359
Chapter 4 Broadband
eircom F1000 Modem User’s Guide
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Page 69 / 359
eircom F1000 Modem User’s Guide
69
C
HAPTER
5
Wireless
5.1
Overview
This chapter describes the Device’s
Network Setting > Wireless
screens. Use these screens to
set up your Device’s wireless connection.
5.1.1
What You Can Do in this Chapter
This section describes the Device’s
Wireless
screens. Use these screens to set up your Device’s
wireless connection.
•
Use the
General
screen to enable the Wireless LAN, enter the SSID and select the wireless
security mode (
Section 5.2 on page 70
).
•
Use the
More AP
screen to set up multiple wireless networks on your Device (
Section 5.3 on
page 77
).
•
Use the
MAC Authentication
screen to allow or deny wireless clients based on their MAC
addresses from connecting to the Device (
Section 5.4 on page 81
).
•
Use the
WPS
screen to enable or disable WPS, view or generate a security PIN (Personal
Identification Number) (
Section 5.5 on page 82
).
•
Use the
WMM
screen
to enable Wi-Fi MultiMedia (WMM) to ensure quality of service in wireless
networks for multimedia applications (
Section 5.6 on page 83
).
•
Use the
WDS
screen to set up a Wireless Distribution System, in which the Device acts as a
bridge with other ZyXEL access points (
Section 5.7 on page 84
).
•
Use the
Others
screen to configure wireless advanced features, such as the RTS/CTS Threshold
(
Section 5.8 on page 86
).
•
Use the
Channel Status
screen to scan wireless LAN channel noises and view the results
(
Section 5.9 on page 89
).
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Chapter 5 Wireless
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70
5.1.2
What You Need to Know
Wireless Basics
“Wireless” is essentially radio communication. In the same way that walkie-talkie radios send and
receive information over the airwaves, wireless networking devices exchange information with one
another. A wireless networking device is just like a radio that lets your computer exchange
information with radios attached to other computers. Like walkie-talkies, most wireless networking
devices operate at radio frequency bands that are open to the public and do not require a license to
use. However, wireless networking is different from that of most traditional radio communications in
that there a number of wireless networking standards available with different methods of data
encryption.
Finding Out More
See
Section 5.10 on page 89
for advanced technical information on wireless networks.
5.2
The General Screen
Use this screen to enable the Wireless LAN, enter the SSID and select the wireless security mode.
Note: If you are configuring the Device from a computer connected to the wireless LAN
and you change the Device’s SSID, channel or security settings, you will lose your
wireless connection when you press
Apply
to confirm. You must then change the
wireless settings of your computer to match the Device’s new settings.

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