Chapter 7 WAN
LTE3316 Series User’s Guide
54
In the multicast example above, systems
A
and
D
comprise one multicast group. In multicasting, the
server only needs to send one data stream and this is delivered to systems
A
and
D
.
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. The Zyxel Device supports both IGMP version 1 (
IGMP
v1
), IGMP version 2 (
IGMP v2
) and IGMP version 3 (
IGMP v3
).
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 WAN interface in the Web Configurator.
IPv6 Introduction
IPv6 (Internet Protocol version 6), is designed to enhance IP address size and features. The increase in
IPv6 address size to 128 bits (from the 32-bit IPv4 address) allows up to 3.4 x 10
38
IP addresses. The Zyxel
Device can use IPv4/IPv6 dual stack to connect to IPv4 and IPv6 networks, and supports IPv6 stateless
autoconfiguration (SLAAC).
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 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.
IPv6 Subnet Masking
Both an IPv6 address and IPv6 subnet mask compose of 128-bit binary digits, which are divided into
eight 16-bit blocks and written in hexadecimal notation. Hexadecimal uses four bits for each character
(1 ~ 10, A ~ F). Each block’s 16 bits are then represented by four hexadecimal characters. For example,
FFFF:FFFF:FFFF:FFFF:FC00:0000:0000:0000.
Summary of Contents for LTE3316-M604
Page 12: ...12 PART I User s Guide...
Page 40: ...40 PART II Technical Reference...
