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Tunneling is a protocol which allows the movement of data from one network to another in a secure manner.

• It allows the private network communications to be sent over the public network through a process called Encapsulation.

• The encapsulation process allows the data packets which are private to appear as public to a public network.

• The packets pass to the network in an un-noticed manner.

• Tunneling is also known as Port Forwarding.

• The data is divided into small packets and then passed through the tunnel for encapsulation.

• At the destination the process of de-capsulation is performed.

When the IPv6 tunnels through IPv4 routers, the IPv6 treats the IPv4 tunnels as link-layer protocols because the entire IPv6 datagram is encapsulated in an IPv4 datagram.

On the receiving side of the tunnel, the tunnel routes the IPv4 datagram to the remaining nodes according the destination address of the router.

Thus, the statement that says that “When the IPv6 tunnels through IPv4 routers, the IPv6 treats the IPv4 tunnels as link-layer protocols” is acceptable.


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