As I mentioned in one of my previous blogs (/ blogs / 2012/02/03 / ipv6-migration-% e2% 80% 93 -What why-and-how /) there are various possibilities for the transition to IPv6. IPv6 Rapid Deployment (6rd) is one of transition technologies popularized by deploying managed by Free Telecom in France. 6rd is a technique that allows service providers to provision IPv6 addresses to end customers without upgrading their core infrastructure for IPv6. 6rd allows IPv6 hosts separated by IPv4 networks to communicate with each other by establishing an IPv4 tunnel. Update on the side of the sender of the tunnel tunnel origination encapsulates IPv6 traffic within IPv4 packets, and sends them over IPv4 to the device at the opposite end of the tunnel. The device at the other end of the tunnel decapsulates the packets and sends them over the IPv6 network to their destination.
to 6rd work, service providers need to deploy Customer Edge 6rd (EC) on the network customer and Border Relay 6rd (BR) on the outskirts of the ISP IPv4 network. 6rd gateways (EC BR) act as encapsulator and decapsulator for tunneling IPv6 traffic across the IPv4 network. All traffic destined to pass through the ISP network through the relay 6rd border and is routed natively to the IPv6 Internet. Second, traffic destined for IPv6 network in the field of the same ISP 6rd is internally routed. 6rd tunneled traffic follows the IPv4 routing as 6rd devices communicate with each other on their IPv4 addresses.
Central to 6rd are concepts 6rd Prefix, Prefix and Delegated 6rd 6rd field. Prefix is 6rd and IPv6 prefix selected by the Internet service provider for use in a given field 6rd - there is only one 6rd prefix for 6rd field. A delegated prefix 6rd is obtained by combining the prefix 6rd MS and EC IPv4 address and is used in the customer site for the allocation of IPv6 addresses to end hosts. And 6rd domain is a collection of ECs and BRs connected to the same virtual link 6rd sharing the common Prefix 6rd and managed by a single ISP. An ISP can manage multiple 6rd areas - but each EC 6rd can be in a 6rd field and BR 6rd be aware of several 6rd areas under control of the same ISP
6rd is built on automated tunnel concepts 6to4. , Which is a multipoint tunnel point and treats IPv4 network as NBMA link. 6to4 requires using the special IPv6 address also known as 6to4 address that begins with the prefix 02 :: / 16 followed by 32-bit IPv4 address. She pulls the destination IPv4 address of the IPv6 tunnel. 6RD improves with automatic 6to4 tunnel with the key difference that it uses own prefix instead the service provider reserved prefix 02 :: / 16
Although 6rd help ISPs IPv6 connectivity available for end users, but it does not allow IPv6 clients to talk to IPv4 servers. For this to work as NAT64 / SLB64 solutions are required.
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