How to make IPv4 and IPv6 coexist

We are not unfamiliar with the technology of tunneling, and apply it to the interworking between IPv4 and IPv6. Tunneling technology has played an important role in this transitional technology, so let's take a look at some of the relevant terminology and standards for interoperability.

What are the common technical standards for IPV4 and IPV6 interchange conversion at present?

The transition from existing networks to IPV6 networks is technically mature, and this transition can be gradual. ISO and many research and development organizations have developed a variety of IPv4 and IPv6 interchange mechanism. The following is a common technical standard for IPV4 and IPv6 interchange conversion:

6TO4:RFC 3056

NAT-PT (network address Translation-protocol translation): RFC 2766

SIIT (stateless ip/icmp translation): RFC 2765

Tunnel BROKER:RFC 3053

6OVER4:RFC 2529

BIS (bump-in-the-stack): RFC 2767

BIA (BUMP-IN-THE-API): RFC 3338

SOCKS-GATEWAY:RFC 3089

TCP/UDP-RELAY:RFC 3142

Dstm (Dual Stack Transition mechanism): Draft-ietf-ngtrans-dstm-08.txt

ISATAP (intra-site Automatic Tunnel addressing Protocol): Draft-ietf-ngtrans-isatap-08.txt

What is a tunnel? " IPv6 over IPv4 "What does that mean?"

Tunneling (tunnel) is the encapsulation of a protocol header in another protocol header so that a protocol can communicate through the encapsulation of another protocol. The IPv6 tunnel encapsulates the IPV6 header in the IPV4 header so that the IPV6 protocol packet can communicate across the IPV4 network.

Before the IPV6 is fully implemented, there are always some networks that provide support for IPV6, but these IPv6 networks are isolated from the backbone of the IPV4 protocol. "IPv6 over IPV4" tunnels are used to connect these isolated IPV6 networks, complete IPv4 and IPV6 interoperability. Tunnel technology is currently used in the International IPV6 test bed 6Bone technology. Tunneling technology can be used to connect local IPV6 networks through existing Internet backbone networks (i.e. tunnels) running the IPV4 protocol, which is the easiest technology to use in the early stages of IPv4 transition to IPV6.

The advantage of tunneling technology is the transparency of the tunnel, the communication between the IPV6 host can ignore the existence of the tunnel, and the tunnel only plays the role of the physical channel. It does not require a large number of IPV6 dedicated router equipment and dedicated links, can significantly reduce investment. The disadvantage is that it is a cumbersome process to configure the IPv6 tunnel on the IPV4 Network, and tunneling technology does not enable communication between the IPV4 host and the IPV6 host.