Teredo Protocol |best|

Teredo was a critical "bridge" technology that allowed the IPv6 internet to function during the era of NAT-dominant IPv4 networks. By cleverly using UDP to traverse NATs, it solved a significant connectivity gap. However, as native IPv6 adoption matures and security standards tighten, Teredo is fading into obsolescence, serving primarily as a fallback mechanism or a footnote in the history of internet protocols.

: By creating a direct tunnel from the internet to an internal node, Teredo can sometimes bypass traditional firewall security controls. For this reason, security experts often recommend disabling Teredo if native IPv6 is already available. Modern Status and Support teredo protocol