Teredo Tunneling -

| Feature | Teredo | 6to4 | ISATAP | | :--- | :--- | :--- | :--- | | | Home users, NAT environments | Routers with Public IPs | Enterprise intranets | | Requirement | Works behind NAT | Needs Public IPv4 | Needs IPv4 infrastructure | | Protocol | UDP encapsulation | IP Protocol 41 | IP Protocol 41 | | Status | Declining/Deprecated | Mostly defunct | Common in business |

But the era of Teredo is ending. As of 2025, with global IPv6 adoption crossing the 40-50% threshold in many regions (and near 70% in some countries like India and France), the need for this protocol has evaporated. teredo tunneling

Teredo is a marvel of engineering, but it is not a perfect solution. | Feature | Teredo | 6to4 | ISATAP