A dns packet extension method based on application layer dns message segmentation

Abstract

The invention discloses a DNS packet expansion method based on application layer DNS message segmentation, which belongs to the technical field of Internet communication. The method includes: it is necessary to explain the standard of DNS message segmentation, the representation of DNS message fragmentation information, the identification and identification of the DNS message segmentation function of the application layer, and the working principle of fragmentation reinstallation; the segmentation and reassembly of DNS messages are carried out at the application layer , can break through the 512-byte limit of the DNS response message, and transmit it through the UDP protocol, which maintains the flexibility of the DNS protocol and realizes the scalability of the DNS message; this method does not cause IP fragments to be discarded in the middleware. The problem of reassembly failure of IP fragments at the receiving end; there is no need to establish a TCP connection, which can reduce the response time. The server side does not need to maintain the status information of the TCP connection, and at the same time, it has advantages over the TCP-based solution.

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,...

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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.

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