6rd (rapid deployment) is a development of 6to4. The underlying function is identical. The difference is that just one particular relay is used, as operated by a provider. This solves the two basic problems of the 6to4 technology; the lack of security and stability. The prefix with 6rd is either configured manually or sent via DHCP (IPv4), which further reduces the effort involved with configuration. The diagram is a schematic representation of a 6rd scenario.
The provider assigns the router with a prefix (2001:db8::/32), which the router then supplements with its own IPv4 address. The IPv6 address generated in this way has the form: 2001:db8:5019:d302::/64. This makes 6rd interesting from two perspectives. The provider has a simple way to give its customers access to the IPv6 Internet. In addition, customers benefit from greatly simplified usage. They do not have to accept the security risks of 6to4, nor do they have to handle the complicated configuration of 6in4.
