How IPv6 Works and IPV6 Cheat Sheet

4D Data Centres Publishes its White Paper Explaining the New Internet Protocol

IPV6 - How IPv6 Works and IPV6 Cheat SheetWe are on the brink of running out of internet protocol (IP) addresses because the present system, IPv4, has run out of unique number sequences to allocate after 30 years. It is being replaced by IPv6 and many IT directors are asking what’s involved and why should I upgrade? To help answer these questions and educate those interested, David Barker, the founder and technical director of 4D Data Centres, the eco-friendly, Tier 3 colocation and connectivity provider, has published a white paper called IPv6 – A Primer.

The objectively written white paper looks at the evolution of the Internet Protocol version 4 (IPv4) into version 6 (IPv6), the next generation network protocol of the internet, and gives practical advice to IT managers. It includes:

  • The limitations of IPv4
  • IPv6 features
  • The driving forces behind the need for transition
  • How to move from IPv4 to IPv6
  • Suggestions on what users can do now to be prepared for the changeover.

David Barker of 4D Data Centres comments,

“Many ISPs, websites and manufacturers are now supporting IPv6 and following World IPv6 Day (6th June 2012) the issue of internet connectivity is in the limelight. However, I find that many of our customers, both IT managers and resellers, are unclear about how IPv6 works and why IPv4 needs to be replaced. My white paper explains it all in simple language.”

IPv4 vs IPv6: Cheat Sheet



Addresses are 32-bit (4 bytes) in length

Addresses are 128-bit (16 bytes) in length

IPSec encryption is optional

IPSec encryption is required

No packet flow identification contained with the header for QoS handling

Flow label field within the IPv6 header allows for QoS handling

The IPv4 packet header includes all options

Optional data is moved to the IPv6 extension header, header length is standardised and header overhead is reduced. Allows for more efficient packet handling

Broadcast addresses are used to send traffic to all nodes on subnet – it has potential to create broadcast storms.

No IPv6 broadcast address having been replaced by link-local scope. All-nodes multicast address used to eliminate the threat of broadcast storms and allow for a flatter network design.

Must be configured either manually or

through DHCP

Does not require manual configuration or

DHCP. Supports stateless configuration of network configuration.

For more business advice articles on IPV6 and data centres see David Barker’s profile page.

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