What is a common use case for Teredo?

What is a common use case for Teredo?

• A. Replacing IPv4 entirely with IPv6
• B. Providing IPv6 connectivity across NATs using IPv4 UDP encapsulation
• C. Replacing UDP with TCP for IPv6
• D. Providing multicast routing for IPv6 only

Answer: (B)

Teredo is a tunneling mechanism that carries IPv6 traffic over IPv4 networks by encapsulating IPv6 datagrams in UDP packets. This is especially useful for devices behind NATs that don’t have a direct IPv6 path, because the UDP encapsulation can traverse those NATs and reach IPv6 hosts on the Internet via a Teredo server and relay. In short, it provides IPv6 connectivity across NATs without requiring native IPv6 everywhere. It isn’t about replacing IPv4 entirely, it doesn’t swap UDP for TCP for IPv6, and it isn’t a solution for multicast routing in IPv6-only networks.

Teredo is a tunneling mechanism that carries IPv6 traffic over IPv4 networks by encapsulating IPv6 datagrams in UDP packets. This is especially useful for devices behind NATs that don’t have a direct IPv6 path, because the UDP encapsulation can traverse those NATs and reach IPv6 hosts on the Internet via a Teredo server and relay. In short, it provides IPv6 connectivity across NATs without requiring native IPv6 everywhere. It isn’t about replacing IPv4 entirely, it doesn’t swap UDP for TCP for IPv6, and it isn’t a solution for multicast routing in IPv6-only networks.