ZyXEL Communications FMG3025-D10A User Manual

Appendix E IPv6

FMG3024-D10A / FMG3025-D10A Series User’s Guide

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. 

An unspecified address (0:0:0:0:0:0:0:0 or ::) is used as the source address when a device does 
not have its own address. It is similar to “0.0.0.0” in IPv4.

A loopback address (0:0:0:0:0:0:0:1 or ::1) allows a host to send packets to itself. It is similar to 
“127.0.0.1” in IPv4.

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. 

The following table describes the multicast addresses which are reserved and can not be assigned 
to a multicast group. 

Predefined Multicast Address

FF01:0:0:0:0:0:0:1

All hosts on a local node. 

FF01:0:0:0:0:0:0:2

All routers on a local node.

FF02:0:0:0:0:0:0:1

All hosts on a local connected link.

FF02:0:0:0:0:0:0:2

All routers on a local connected link.

FF05:0:0:0:0:0:0:2

All routers on a local site. 

FF05:0:0:0:0:0:1:3

All DHCP severs on a local site. 

Reserved Multicast Address

FF00:0:0:0:0:0:0:0

FF01:0:0:0:0:0:0:0

FF02:0:0:0:0:0:0:0

FF03:0:0:0:0:0:0:0

FF04:0:0:0:0:0:0:0

FF05:0:0:0:0:0:0:0

FF06:0:0:0:0:0:0:0

FF07:0:0:0:0:0:0:0