IPV6 6rd


6RD tunnels IPv6 traffic over IPv4 backbone. It is mainly targeted from service providers.

6RD Overview

  • 6RD stands for Rapid Deployment as initials of its inventor Remi Despres.
  • Architecturally it has two components: 6RD CE and 6RD BR (Border Relay)
  • 6 RD CE encapsulated IPv6 native packets over IPv4 to traverse the IPv4 only backbone. It is a dual stack device.
  • Encapsulation is based on IPv6-in-IPv4 tunnel using protocol IP Protocol 41.
  • 6 RD BR decapsulates the packets to the edge of the network connected to native IPv6 internet.
  • The CE will either encapsulate IPv6 and send it to the BR or another CE, depending on the configure IPv6 6rd domain prefix.
  • The IPv6 address is similar to 6to4 where the IPv4 address is embedded into the IPv6 address. The major difference and advantage is that 6RD doesn't use a well-know 6to4 prefix (2002::/16) but uses the provider's addressing.
  • Within the 6RD addressing an IPv4 address of the destination tunnel is embedded.
  • Internal addressing (CE to CE IPv6 traffic), can use what's called IPv4 common prefix and IPv4 common suffix
    • IPv4 common prefix
    • IPv4 common suffix
source:IPv6 Rapid Deployment
  • Address allocation can be done with DHCP.
  • Border Gateways IPv4 address are usually advertised as anycast addresses for redundancy and simplification

Additional Resources

RFC5969 IPv6 vis IPv4 Service Provider Networks - IETF
IPv6 Rapid Deployment - Wikipedia
IPv6 Rapid Deployment: Provide IPv6 Access to Customers over an IPv4-Only Network - Cisco
6RD - RIPE Video


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