DNS (Domain Name Server) packet extension method based on DNS message segmentation of application layer

Abstract

This invention discloses a DNS (Domain Name Server) packet extension method based on DNS message segmentation of an application layer, and relates to the technical field of internet communication. The method comprises the following steps: specifying a DNS message segmentation standard, a representation of a fragment message of the DNS message, an identification and recognition of the DNS message segmentation function of the application layer, and a working principle of the fragment reassembly; by segmenting and reassembling the DNS message on the application layer, breaking through the limit of 512 bytes to the DNS response message; and through using UDP (User Datagram Protocol) transmission, keeping the flexibility of the DNS protocol and simultaneously realizing the expandability of the DNS message. By adopting this method, the problem of reassembly failure of an IP (Internet Protocol) fragment at a receiving terminal due to the fact that the IP fragment is discarded in middleware can be solved; without the need for a TCP (Transmission Control Protocol) connection, the response time can be reduced; the server end is unnecessary to maintain the status information of the TCP connection, and simultaneously compared with the scheme based on TCP, the method has the superiority.

Description

technical field [0001] The invention belongs to the technical field of Internet communication, and in particular relates to a DNS packet expansion method based on application layer DNS message segmentation. Background technique [0002] DNS provides an important service on the Internet. Its essence is to establish a bridge between the world of human names and the world of underlying binary protocol addresses. Every time, before we start any transaction through the Internet, a DNS query process must first Complete; so a lightweight, fast-response DNS protocol is very necessary, so that the DNS query process can be completed transparently to users, the DNS resolution framework uses UDP as the transport protocol, and through geographically distributed A recursive parser is implemented. [0003] At the same time, in the process of Internet development, the traditional DNS protocol has also highlighted some problems. Due to the limitation of the packet size of the IPv4 protocol,...

AI Technical Summary

Problems solved by technology

However, in general, due to the longer delay and greater resource consumption of the TCP protocol, people still take a very cautious and conservative attitude towards the use of TCP for DNS message transmission

[0007] The traditional DNS protocol and some expansion and improvement schemes cannot solve the scalability problem of the DNS protocol well.

Images