// Test IPv6 connectivity via Teredo ping -6 ipv6.google.com
Report ID: NET-IPv6-002 Date: October 2023 (Updated for 2024 context) Author: Network Architecture Team Subject: Teredo Tunneling (IPv6 over UDP over IPv4) 1. Executive Summary The Teredo protocol is a network transition mechanism defined in RFC 4380 (updated by RFC 5991 and RFC 6346). Its primary purpose is to provide IPv6 connectivity to nodes located behind Network Address Translation (NAT) devices that do not support native IPv6 and cannot utilize other tunneling methods like 6to4 (which requires a public IPv4 address). teredo protocol
With the accelerating global adoption of native IPv6 and superior translation mechanisms like NAT64, Teredo has reached end-of-life. It remains a footnote in networking history—a bridge that served its purpose but is now being dismantled. Organizations and users should actively disable Teredo unless a specific, non-replaceable dependency (like older Xbox gaming) exists. // Check Teredo status netsh interface teredo show state // Enable Teredo (client mode) netsh interface teredo set state client // Test IPv6 connectivity via Teredo ping -6 ipv6