This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

CCIE #29033

This blog will continue to include questions, troubleshooting scenarios, and references to existing and new technologies but will grow to include a variety of different platforms and technologies. Currently I have created over 185 questions/answers in regards to the CCIE R&S track!! Note: answers are in the comment field or within "Read More" section.

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Friday, April 23, 2010

Question 14

What are the types of ways that you can migrate from IPv4 to IPv6?

1 comments:

Terry Edwards said...

Here are a couple of different ways of migrating that I know about:

1. Dual-stack: Which assumes that hosts and routers provide support for both protocols and can send and receive both IPv4 and IPv6 packets. It can operate as Only IPv4 stack enabled, Only IPv6 stack enabled or IPv4 and IPv6 stacks enabled.

2. Configured Tunneling Translation: Bidirectional tunnels are used as point-to-point links between two network end points. IPv4 routing infrastructure remains functional but also carries IPv6 while the IPv6 routing infrastructure is under development. Data passes through the tunnel using encapsulation, in which the IPv6 packet is carried inside an IPv4 packet.

3. Automatic Tunneling: Allows IPv4/IPv6 nodes to communicate without using preconfigured tunnels. The nodes that perform automatic tunneling are assigned a special type of address called an IPv4-compatible address, which carries the 32-bit IPv4 address within a 128-bit IPv6 adresses format. The IPv4 address can be automatically extracted from the IPv6 address.

4. 6to4: 6to4 tunneling allows IPv6 sites to communicate with each other via an IPv4 network without using explicit tunnels and to communicate with native IPv6 domains via relay routers. This strategy treats the IPv4 Internet as a single data link.

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