Global Address; Multicast Address - ZyXEL Communications IES4005M User Manual

Chapter 19 IPv6
Link-local Address
A link-local address uniquely identifies a device on the local network (the LAN). It is similar to a
"private IP address" in IPv4. You can have the same link-local address on multiple interfaces on a
device. A link-local unicast address has a predefined prefix of fe80::/10. The link-local unicast
address format is as follows.
Table 95 Link-local Unicast Address Format
1111 1110 10
10 bits

Global Address

A global address uniquely identifies a device on the Internet. It is similar to a "public IP address" in
IPv4. A global unicast address starts with a 2 or 3. The global address format as follows.
Table 96 Global Address Format
001 Global ID
3 bits 45 bits
The global ID is the network identifier or prefix of the address and is used for routing. This may be
assigned by service providers.
The subnet ID is a number that identifies the subnet of a site.

Multicast Address

In IPv6, multicast addresses provide the same functionality as IPv4 broadcast addresses.
Broadcasting is not supported in IPv6. A multicast address allows a host to send packets to all hosts
in a multicast group.
Multicast scope allows you to determine the size of the multicast group. A multicast address has a
predefined prefix of ff00::/8. The following table describes some of the predefined multicast
addresses.
Table 97 Predefined Multicast Address
MULTICAST ADDRESS
FF01:0:0:0:0:0:0:1
FF01:0:0:0:0:0:0:2
FF02:0:0:0:0:0:0:1
FF02:0:0:0:0:0:0:2
FF05:0:0:0:0:0:0:2
FF05:0:0:0:0:0:1:3
144
0 Interface ID
54 bits 64 bits
Subnet ID Interface ID
16 bits 64 bits
DESCRIPTION
All hosts on a local node.
All routers on a local node.
All hosts on a local connected link.
All routers on a local connected link.
All routers on a local site.
All DHCP severs on a local site.
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