![]() However, many hosts are currently attached to the IPv4 Internet through one or several NAT devices, and in such a situation, the only available public IPv4 address is assigned to the NAT device, and the 6to4 tunnel endpoint needs to be implemented on the NAT device itself. ![]() Other Teredo nodes elsewhere called Teredo relays that have access to the IPv6 network then receive the packets, unencapsulate them, and route them on.Īlso, 6to4, the most common IPv6 over IPv4 tunneling protocol, requires the tunnel endpoint to have a public IPv4 address. These datagrams can be routed on the IPv4 Internet and through NAT devices. Teredo operates using a platform independent tunneling protocol designed to provide IPv6 connectivity by encapsulating IPv6 datagram packets within IPv4 User Datagram Protocol (UDP) packets. ![]() To overcome this shortcoming, the Teredo tunneling method was developed, which is used to give full IPv6 connectivity to IPv6 hosts even from behind a NAT device. There are various tunneling methods that have been developed before Teredo such as 6to4 for IPv6 (Internet Protocol version 6) packets as payload of IPv4, but with tunneling methods like 6to4 there is a limitation that it won’t work for the IPv6 devices sitting behind a NAT. Teredo has some security considerations which will be covered later in this document. There are various transition technologies already in place such as 6to4, but because of some shortcoming of the existing technologies, Teredo was developed. ![]() In this article we will learn about a transition technology in networking known as Teredo tunneling. ![]()
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