Tunnelling

• 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!!