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6to4 – the most common IPv6 over IPv4 tunnelling protocol. Tunnel endpoints must have public IPv4 addresses
Teredo – encapsulating IPv6 inside IPv4/UDP
- NAT-T is supported
- Globally unique IPv6 address is assigned to each endpoint
- Windows Vista: enabled, but not active by default (teredo.ipv6.microsoft.com)
Can be a security issue!!