from Wikipedia, the free encyclopedia
IPv6 transition mechanisms
4in6 Tunneling from IPv4 to IPv6
6in4 Tunneling from IPv6 to IPv4
6over4 Transport of IPv6 data packets between dual-stack nodes over an IPv4 network
6to4 Transport of IPv6 data packets over an IPv4 network (obsolete)
AYIYA Anything In Anything
Dual stack Network nodes with IPv4 and IPv6 in parallel operation
Dual-Stack Lite (DS-Lite) Like dual stack, but with global IPv6 and carrier NAT IPv4
6rd IPv6 rapid deployment
ISATAP Intra-Site Automatic Tunnel Addressing Protocol (deprecated)
Teredo Encapsulation of IPv6 packets in IPv4 UDP -Datenpaketen
NAT64 Translation of IPv4 addresses into IPv6 addresses
464XLAT Translation from IPv4 to IPv6 to IPv4 addresses
SIIT Stateless IP / ICMP translation

4in6 is an IPv6 -Übergangsmechanismus, the transmission of IPv4 - data packets enables an IPv6 network.


With 4in6, the IPv4 data traffic is packaged in IPv6 data packets to enable IPv4 nodes to establish a tunnel through an IPv6 network. As a result of the encapsulation of the IPv4 data packets in IPv6 data packets, IPv4 nodes that do not support IPv6 can still communicate via an IPv6 network.

What is needed is on both sides of a dual-stack - router that supports the parallel operation of both protocols. From the perspective of the IPv4 nodes, the IPv6 infrastructure is used as a link layer (security layer in the OSI model ).

4in6 tunnels can be configured manually or automatically using other protocols such as TSP .

4in6 can only be implemented via tunnel brokers . Mostly these are internet providers who offer IPv6 transitions for specific countries or regions and can only be used after prior registration.



  • RFC 2473 , Generic Packet Tunneling in IPv6

Individual evidence

  1. 2473, Generic Packet Tunneling in IPv6 , Section 1
  2. cf. Franz-Joachim Kauffels: Fundamentals of network technology, Heidelberg, mitp 2007, ISBN 978-3-8252-8377-3 , p. 327
  3. 4in6