Tunneling Techniques
When IPv6 development and initial deployment began in the 1990s, most of the world’s networks were already built on an IPv4 infrastructure. As a result, several groups recognized that there was going to be a need for ways to transport IPv6 over IPv4 networks, and, as some people anticipated, vice versa.
One of the key reasons for tunneling is that today’s Internet is IPv4-based, yet at least two major academic and research networks use IPv6 natively, and it is desirable to provide mechanisms for hosts on those networks to reach each other over the IPv4 Internet. Tunneling is one of the ways to support that communication.
As you may gather, tunneling meets a number of needs in a mixed IPv4 and IPv6 world; as a result, several kinds of tunneling methods have emerged.
Tunneling Overview
Tunneling, in a general sense, is encapsulating traffic. More specifically, the term usually refers to the process of encapsulating traffic at a given layer of the OSI seven-layer model within another protocol running at the same layer. Therefore, encapsulating IPv6 packets within IPv4 packets and encapsulating IPv4 packets within IPv6 packets are both considered tunneling.
When IPv6 development and initial deployment began in the 1990s, most of the world’s networks were already built on an IPv4 infrastructure. As a result, several groups recognized that there was going to be a need for ways to transport IPv6 over IPv4 networks, and, as some people anticipated, vice versa.
One of the key reasons for tunneling is that today’s Internet is IPv4-based, yet at least two major academic and research networks use IPv6 natively, and it is desirable to provide mechanisms for hosts on those networks to reach each other over the IPv4 Internet. Tunneling is one of the ways to support that communication.
As you may gather, tunneling meets a number of needs in a mixed IPv4 and IPv6 world; as a result, several kinds of tunneling methods have emerged.
Tunneling Overview
Tunneling, in a general sense, is encapsulating traffic. More specifically, the term usually refers to the process of encapsulating traffic at a given layer of the OSI seven-layer model within another protocol running at the same layer. Therefore, encapsulating IPv6 packets within IPv4 packets and encapsulating IPv4 packets within IPv6 packets are both considered tunneling.
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