What is IPv6?

And What do you know about IPv6?

Internet Protocol version 6 (IPv6) is the next-generation Internet Protocol version designated as the successor to IPv4, the first implementation used in the Internet that is still in dominant use . It is an Internet Layer protocol for packet-switched internetworks. ...

 What are the Benefits of Using IPv6?

The new features and functionality in IPv6 address many IPv4 limitations.

IPv6 enhancements help enable secure communication on the Internet and over corporate networks.

Some IPv6 features include the following:

• Larger address space: IPv6 uses a 128-bit address space, which provides significantly more addresses than IPv4.

• More efficient routing: IANA provisions global addresses for the Internet to support hierarchical routing. This reduces how many routes that Internet backbone routers must process and improves routing efficiency.

• Simpler host configuration: IPv6 supports dynamic client configuration by using DHCPv6. IPv6 also enables routers to configure hosts dynamically.

• Built-in security: IPv6 includes native IPSec support. This ensures that all hosts encrypt data in transit.

• Better prioritized delivery support: IPv6 includes a Flow Label in the packet header to provide prioritized delivery support.

This designates the communication between computers with a priority level, rather than relying on port numbers that applications use. It also assigns a priority to the packets in which IPSec encrypts the data.

• Redesigned header: The design of the header for IPv6 packets is more efficient in processing and extensibility.

IPv6 moves nonessential and optional fields to extension headers for more efficient processing. Extension headers are no more than the full size of the

IPv6 packet, which accommodates more information than possible in the 40 bytes that the IPv4 packet header allocates.

 Comparison between ipv4 and ipv6:

Why to use IPv6 Video:

 What Is the IPv6 Address Space?

The IPv6 address space uses 128-bits compared to the 32-bits that the IPv4 address space uses. Therefore, a larger number of addresses are possible with IPv6 than with IPv4. An IPv6 address allocates 64-bits for the network ID and 64-bits for the host ID.

IPv6 does not use a dotted decimal notation to compress the addresses. Instead, IPv6 uses hexadecimal notation, with a colon between each set of four digits. Each hexadecimal digit represents four bits. To shorten IPv6 addresses, drop leading zeros and use zero compression.

By using zero compression, you represent multiple contiguous groupings of zeros as a set of double colons.

Each IPv6 address uses a prefix to define the network ID. The prefix is a forward slash followed by the number of bits that the network ID includes.

 Examples for IPv6 address space:

 IPv6 address types:

• Link-local address:

All computers that support IPv6 generates a fixed and auto configured address called link-local address (it’s formed from each NIC routing prefix and the interface's MAC address.); Link-local still enabled always even the system has been assigned by another IP address from DHCP or manually.

A link-local address is an IP address that is intended only for communications within the local subnet work. Routers do not forward packets with link-local addresses.

Link-local address may be used when no external connection, and it’s a state full mechanism of auto address configuration “”such as the Dynamic Host Configuration Protocol (DHCP)””  exists or another primary configuration method has failed.

On IPv6, link-local addresses are required for the internal functioning of various protocol components like Neighbor Discovery Protocol (NDP).

Link-local addresses for IPv4 (APIPA) are defined in the address block 169.254.0.0/16. In IPv6, they are allocated with the fe80::/8 prefix.

• Unique local unicast address:

These are the equivalent to IPv4 private address spaces and always start with ,

• Global unicast address:

These addresses are equivalent to IPv4 public addresses so they are globally routable and reachable on the IPv6 portion of the Internet and assigned by IANA.

 IPv6 and IPv4 Addresses types’ comparison:

 How to assign IPv6 address on Windows 7 or Windows Server 2008:

To configure IPv6 manually you have to follow the down steps

1. Open the control panel from start menu and access the "Network And Sharing Center".
   
   
   
    

2. Inside the "Network And Sharing Center" you have to choose "Change Adapter Settings" from the task pane.
   
   
   
    

3. Press right click on the "Local Area Connection" icon , then choose properties and inside the properties page select the "Internet Protocol Version 6 (TCP/IPv6)" and Click on Properties

4. Now inside this page you can choose "Use The Following IPv6 Address" and enter the suitable address information as the following:
   
   

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 Storages Connectivity Types Click Here.

 NAS, SAN and DAS Compression Click Here.

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