Advantages of multidimensional parsing IPv6 protocol

IPv4 is an indelible network, but it cannot meet our needs as we need wireless networks. Now it is about to quit dance, instead of IPv6. However, based on Internet operation experience over the years, we should make some "revolutionary" changes to other parts of IPv4, the biggest change in IPv6 protocol is to obviously simplify the header design, which is mainly reflected in:

◆ Simplified the Header Format. All headers use a fixed length;

◆ Reduce sensitive parts of packet processing, such as checksum and sharding;

◆ The length of the address is increased to bits ｡

Although IETF has chosen IPv6 as the next-generation Internet (NGN) protocol, there are still some controversies in the industry about IPv6 technology, and even some arguments have been made ｡

(1) Quality of Service (QoS) assurance. IPv6 headers have indeed improved performance, such as removing the checksum field, however, this is totally different from the so-called QoS protection currently studied. Currently, the technologies that address IP QoS are mainly DiffServ, InterServ, and Multi-Protocol Label Switching (MPLS ), they are also applicable to both IPv4 and IPv6. In other words, IPv6 uses the same technology as IPv4 to solve QoS problems. Without IPv6, the service quality will be guaranteed ｡

(2) security assurance. Both IPv4 and IPv6 use the IPSec protocol to provide security assurance. The difference is that IPv4 has optional requirements on IPSec, IPv6 requires only IPSec. However, IPv6 only requires implementation and does not require all applications to use IPSec, second, the use of both products will have a significant impact on performance. Therefore, the security of the two products is almost equivalent from this point, and there is no possibility that IPv6 will be safer than IPv4 ｡

(3) better mobility support. We should not deny that IPv6 provides better mobility support (Mobbie IP) than IPv4, but note that: only when the Mobile IP business has practical market application values can we explore how to better support it? Mobile IP has not been widely used since its birth. The root cause is the lack of "Killer Application )", that is to say, there has not been an application that greatly promotes Internet development like E-mail. WWW, mobile IP must or is better to be used for support. Such applications (such as the popularization of 3G) may appear in the future, but they are not, at least not obvious or have not been popularized on a large scale ｡

(4) according to a report published by Internet Society, there are still some misunderstandings or sayings about IPv6:

◆ IPv6 is required for mobility ｡

◆ IPv6 is more suitable for wireless networks ｡

◆ Only IPv6 supports automatic configuration ｡

◆ IPv6 solves the routing scalability problem ｡

◆ IPv6 better supports fast prefix numbering ｡

◆ IPv6 provides better support for Multi-home ｡

Summary

Some people think that IPv4 addresses will soon run out, so IPv6 will be commercially available in recent years, which is questionable. According to IANA, about 36% of Public IPv4 addresses (about 1.5 billion) are not allocated, as a result, the address shortage problem is not as serious or urgent as described by some media or manufacturers. Although IANA's application policy for IPv4 addresses tends to be strict, however, if the operator does have the need, it can still be applied for. The current IP Address Allocation speed remains the same, and it is conservatively estimated that IPv4 addresses will only be used up after 2015 ｡

Secondly, it is generally believed that mobile data services require a large amount of IP address space resources and must use IPv6 addresses. However, the actual situation is that many mobile data operators do not adopt a completely open business model of the Internet, instead, they prefer the commercial model of "Walled Garden", namely, limiting users to a closed network, because in this way, operators can easily control their businesses and users, making billing convenient, and the security is higher. When the "Walled Garden" business model is adopted, the mobile data network and the Internet form an isolated addressing domain, as a result, operators almost choose to use (private) IPv4 addresses that are more mature, cheap, and familiar ｡

Third, the-bit IPv6 address must be in the middle so that "each grain of sand on the earth is allocated to an IP address ", that is to say, IPv6 address space will no longer be a rare resource. Since it is not a rare resource, it is unlikely to become a rare resource in the future. Even if more IPv6 address space is obtained, how much practical significance does it have?

Fourth, both NAT technology and IPv6 can solve address shortage problems. I think the core problem of NAT is to undermine the end-to-end transparency of the Internet, therefore, it is only applicable to applications in the customer/Server mode. The biggest advantage of IPv6 is that it can support Peer-to-Peer (P2P) applications, because it will not damage the Internet's end-to-end transparency, IPv6 must be deployed only when P2P applications (such as games) are widely used ｡