However, many hosts currently attach to the IPv4 Internet through one or several NAT devices, usually because of IPv4 address shortage. ( September 2021) ( Learn how and when to remove this template message)įor 6to4, the most common IPv6 over IPv4 tunneling protocol, requires that the tunnel endpoint have a public IPv4 address. Unsourced material may be challenged and removed.

Please help improve this section by adding citations to reliable sources. The Teredo server listens on UDP port 3544.

Christian Huitema developed Teredo at Microsoft, and the IETF standardized it as RFC 4380. Teredo should be disabled when native IPv6 connectivity becomes available. In the long term, all IPv6 hosts should use native IPv6 connectivity. Teredo nodes elsewhere on the IPv6 network (called Teredo relays) receive the packets, un-encapsulate them, and pass them on. Teredo routes these datagrams on the IPv4 Internet and through NAT devices. Teredo operates using a platform independent tunneling protocol that provides IPv6 (Internet Protocol version 6) connectivity by encapsulating IPv6 datagram packets within IPv4 User Datagram Protocol (UDP) packets. Unlike similar protocols such as 6to4, it can perform its function even from behind network address translation (NAT) devices such as home routers.

In computer networking, Teredo is a transition technology that gives full IPv6 connectivity for IPv6-capable hosts that are on the IPv4 Internet but have no native connection to an IPv6 network.

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