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Page 101 / 240 Scroll up to view Page 96 - 100
Chapter 4 WAN
Basic Home Station VDSL2 P8701T User’s Guide
101
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 VDSL Router queries all directly connected networks to gather group membership.
After that, the VDSL Router 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 VDSL Router 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 VDSL Router’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
Page 102 / 240
Chapter 4 WAN
Basic Home Station VDSL2 P8701T User’s Guide
102
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 103 / 240
Basic Home Station VDSL2 P8701T User’s Guide
103
C
HAPTER
5
LAN Setup
5.1
Overview
A Local Area Network (LAN) is a shared communication system to which many networking devices
are connected. It is usually located in one immediate area such as a building or floor of a building.
Use the LAN screens to help you configure a LAN DHCP server and manage IP addresses.
5.1.1
What You Can Do in this Chapter
•
Use the
LAN Setup
screen to set the LAN IP address, subnet mask, and DHCP settings of your
VDSL Router (
Section 5.2 on page 104
).
•
Use the
Static DHCP
screen to assign IP addresses on the LAN to specific individual computers
based on their MAC Addresses (
Section 5.2.1 on page 106
).
•
Use the
IPv6 Autoconfig
screen to set the Local Area Network interface IPv6 settings (
Section
5.3 on page 107
).
DSL
LAN
Page 104 / 240
Chapter 5 LAN Setup
Basic Home Station VDSL2 P8701T User’s Guide
104
5.1.2
What You Need To Know
IP Address
IP addresses identify individual devices on a network. Every networking device (including
computers, servers, routers, printers, etc.) needs an IP address to communicate across the
network. These networking devices are also known as hosts.
Subnet Mask
Subnet masks determine the maximum number of possible hosts on a network. You can also use
subnet masks to divide one network into multiple sub-networks.
DHCP
A DHCP (Dynamic Host Configuration Protocol) server can assign your VDSL Router an IP address,
subnet mask, DNS and other routing information when it's turned on.
DNS
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address and
vice versa. The DNS server is extremely important because without it, you must know the IP
address of a networking device before you can access it.
RADVD (Router Advertisement Daemon)
When an IPv6 host sends a Router Solicitation (RS) request to discover the available routers,
RADVD with Router Advertisement (RA) messages in response to the request. It specifies the
minimum and maximum intervals of RA broadcasts. RA messages containing the address prefix.
IPv6 hosts can be generated with the IPv6 prefix an IPv6 address.
Finding Out More
See
Section 5.4 on page 109
for technical background information on LANs.
5.1.3
Before You Begin
Find out the MAC addresses of your network devices if you intend to add them to the DHCP Client
List screen.
5.2
The LAN Setup Screen
Click
Wireless network > Classic configuration > Advanced Setup > LAN
to open the
LAN
Setup
screen. Use this screen to set the Local Area Network interface settings.
Page 105 / 240
Chapter 5 LAN Setup
Basic Home Station VDSL2 P8701T User’s Guide
105
Figure 33
LAN Setup
The following table describes the fields in this screen.
Table 28
LAN Setup
LABEL
DESCRIPTION
IP Address
Enter the LAN IP address to assign to your VDSL Router in dotted decimal notation,
for example, 192.168.1.1 (factory default).
Subnet Mask
Type the subnet mask of your network in dotted decimal notation, for example
255.255.255.0 (factory default). Your VDSL Router automatically computes the
subnet mask based on the IP Address you enter, so do not change this field unless
you are instructed to do so.

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