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IPv6 Address Types

IPv6 has some similar and some different address types than IPv4. There are still unicast addresses in IPv6 world but this time there will be one more Unicast address types. Still multicast addresses are being used but with different addresses.

One additional address type is also in IPv6 world. This is anycast address.

By the way in IPv6 there is no broadcast address type.

Some of the concepts like public and private addresses will still remain in IPv6. But with some differences.

Let’s see all these address types one by one.

Mainly, there are three address types in IPv6. These address types are:

• IPv6 Reserved Addresses
• IPv6 Unicast Addresses
• IPv6 Multicast Addresses
• IPv6 Anycast Addresses

IPv6 Reserved Addresses

These addresses are start with “0000 0000” at first 8 bits. Its prefix is 0::/8 .

For example:

0:0:0:0:0:0:0:0 Unspecified Address
0:0:0:0:0:0:0:1 Loopback Address

IPv6 Unicast Addresses

IPv6 has Unicast address similar to IPv4 unicast address, but it has also other new unicast addresses. These Unicast address types are:

• Global Unicast IPv6 Address
• Link-Local IPv6 Address
• Unique Local IPv6 Address

Let’s check all these address types deeply.

Global Unicast IPv6 Address

The IPv6 address of Internet. This address type is like IPv4 Public addresses. This is unique on internet like them. But this time, this address space is very big and cover all of the devices that use IP address. Global Unicast IPv6 Address has the prefix 2000::/3.



Link-Local IPv6 Address

Link-Local IPv6 Address is the local address assigned only in a single subnet. They are only used on the same link. This addresses are not routable. They are only used for neighbour discovery and next hop configuration.


Unique Local IPv6 Address

Unique Local IPv6 Addresses are like IPv4 Private addresses. They are used on local networks and they can not used on Internet. But with IPv6 NAT you can use Unique Local IPv6 Address on Internet.


Anycast Addresses

Anycast addresses are new address type of IPv6. This address is assigned to a set of interfaces that typically belong to the different nodes. Then, when a packet send to the anycast address, teh packet is delivered to the closest node.


Multicast Addresses

Multicast addresses are the IPv6 addresses that has a prefix of FF00::./8. A packet that sent to a multicast address, is delivered by the interfaces identified by that multicast address.

The first octet are full of 1(1111 1111). And the second octet is consist of flags and scope values. The lifetime is “0” then the multicast address is permanent, if it is “1”, then the multicast address is temporary. And the scope part indicates that if the multicast address is in which scope, a node, a link, a site or an organization.

Basically, we can say that there are two types of IPv6 multicast addresses. These are:

• IPv6 Assigned Multicast Addresses
• IPv6 Solicited-Node Multicast Addresses

You can find the assigned Multicast address diagram below:


Beside, there are many reserved wellknown multicast addresses in IPv6 like IPv4. This are link-local scope addresses. We can give the below examples to these IPv6 link-local scope addresses:

FF02::1 All nodes
FF02::2 All Routers
FF02::5 OSPFv3 Routers
FF02::6 OSPFv3 DRs
FF02::9 RIPng Router
FF02::A EIGRP Routers
FF02::B Mobile Agents
FF02::C DHCP Servers
FF02::D PIM Routers

As you can see, there are different IPv6 Link-Local Scope Multicast addresses above. Each of these address are belong to a specific group, protocol etc.

In IPv6 Multicast, there are also another special reserved multicast addresses. These IPv6 multicast addresses are called “Solicited-Node” multicast addresses. These “Solicited-Node” multicast are produced automatically by the router.

“Solicited-Node” multicast addresses provide an efficient ARP mechanism with IPv6 Neighbour Discovery Protocol.

How are these “Solicited-Node” multicast addresses produced? As we mentione before, “Solicited-Node” multicast addresses are automatically produced. It takes the low order 24 bits of IPv6 address and appends these bits to FF02:0:0:0:0:1:FF00::/104 prefix.

Below, you can find a shape of “Solicited-Node” multicast address.


I hope this article will be usefull for you….If so, keep on ipcisco.com ;)

You can find the other IPv6 articles below…

IPv6 – Part 1 (IPv6 and IPv6 Addresses)
IPv6 – Part 2 (What does IPv6 bring?)
IPv6 – Part 3 (Address Types in IPv6)
IPv6 – Part 4 (Subnetting IPv6)

IPv6 Static Route Configuration Examples…

IPv6 Static Route Configuration on Cisco
IPv6 Static Route Configuration on Juniper

IPv6 Routing Protocols…

IPv6 Routing Protocols – Part 1
IPv6 Routing Protocols – Part 2 (OSPFv3)
IPv6 Routing Protocols – Part 3 (EIGRP for IPv6)
IPv6 Routing Protocols – Part 4 (RIPng)
IPv6 Routing Protocols – Part 5 (ISIS for IPv6)

IPv6 Routing Protocols CONFIGURATIONs..!

Static/Default Route Configuration Example On Cisco IOS
OSPFv3 Configuration Example On Cisco IOS
EIGRP for IPv6 Configuration Example On Cisco IOS
RIPng Configuration Example On Cisco IOS
ISIS for IPv6 Configuration Example On Cisco IOS

IPv4 and IPv6 Headers…

IPv4 and IPv6 Headers

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About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

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