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Migration from IPv4 to IPv6

(Salem, Massachusetts - ROC (Taiwan) Student Association of MIT)





IPv6 Migration Technologies


Available IPv6 Transition Techniques
(Available IPv6 Transition Technologies - Cisco)

The key to success in the IPv6 migration process resides in such compatibility: in being able to use both IPv4 and IPv6 protocols until all the services migrate to IPv6. Most Internet’s nodes are going to need to use both protocols (IPv4 and IPv6) for a long time. Because of this, it is very important to analyze the migration methods to IPv6 and to chose the most suitable one, depending on the operator’s network. It is known that any attempt to have a quick transaction is destined to fail and that gradual transaction schemes are needed. 

[Cisco NAT64 Technology]: Connecting IPv6 and IPv4 Networks - three main options are available for migration to IPv6 from the existing network infrastructure: dual-stack network, tunneling, and translation.  


  • Dual-Stack Network: Dual stack is a transition technology in which IPv4 and IPv6 operate in tandem over shared or dedicated links. In a dual-stack network, both IPv4 and IPv6 are fully deployed across the infrastructure, so that configuration and routing protocols handle both IPv4 and IPv6 addressing and adjacencies.
  • Tunneling: Using the tunneling option, organizations build an overlay network that tunnels one protocol over the other by encapsulating IPv6 packets within IPv4 packets and IPv4 packets within IPv6 packets. The advantage of this approach is that the new protocol can work without disturbing the old protocol, thus providing connectivity between users of the new protocol.
  • Translation: Address Family Translation (AFT), or simply translation, facilitates communication between IPv6-only and IPv4-only hosts and networks (whether in a transit, an access, or an edge network) by performing IP header and address translation between the two address families.


Please refer to Cisco NAT64 Technology: Connecting IPv6 and IPv4 Networks for more details.


However, it seems like the industry is taking a long time to migrate from IPv4 to IPv6. Part of the reason is that network address translation (NAT) helped delay the transition. NAT makes it possible to direct traffic to thousands and thousands of individual IP addresses on private networks through NAT gateways that each use up just one public IP address.  




[More to come ...]


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