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Teredo is an automatic tunneling technique used to provide IPv6 connectivity to devices that are located behind IPv4 NATs (Network Address Translators) and do not have native IPv6 connectivity. Teredo works by packaging IPv6 packets within IPv4 User Datagram Protocol (UDP) packets. This allows the IPv6 packets to be transmitted over the IPv4 internet, essentially “tunneling” through IPv4-only networks to reach IPv6-capable destinations.
In the context of Teredo, an IPv4 address is not directly “obfuscated” but is rather used to facilitate the connection between the Teredo client (behind an IPv4 NAT) and the Teredo server (accessible on the IPv4 internet). The Teredo protocol constructs an IPv6 address that encapsulates the client’s public IPv4 address and the client’s NAT’s UDP port number to which the Teredo server can send packets. This IPv6 address enables the routing of packets from the Teredo server to the Teredo client through the IPv4 NAT.
The composition of a Teredo IPv6 address includes several components, including:
– The Teredo prefix (2001:0::/32) as standardized by the Internet Engineering Task Force (IETF).
– A server IPv4 address, representing the Teredo server that facilitates the Teredo tunnel.
– A flags field, used for various control purposes.
– An obscured external IPv4 address, which is the public IPv4 address of the NAT device,
A. 96 to 127