Availability detection method and device for transmission control protocol

Abstract

The invention discloses an availability detection method and device for a transmission control protocol, and the method comprises the steps: determining a target domain name, a domain name system server address and a gateway address, and detecting whether a source address can be connected with the target domain name or not; further detecting whether the source address can be connected with the domain name system server address in response to the situation that the source address cannot be connected with the target domain name; selectively returning that the gateway is not reachable or the domain name system server is not reachable according to whether the source address can be connected with the gateway address; and selectively returning a domain name system server fault or preset interface unavailability according to whether the source address can be connected with the preset interface. According to the method, error reasons can be given under the condition that the target domain name cannot be accessed, and faults can be quickly positioned and removed so as to facilitate further processing.

Description

technical field [0001] The present invention relates to the field of network transmission, and more specifically, to a method and device for detecting availability of a transmission control protocol. Background technique [0002] DNS, or domain name system, is one of the important services of the Internet. It is a distributed database that maps domain names and IP network addresses to each other, enabling people to access the Internet more conveniently. For example, when we access the Baidu search engine, the common method is to enter www.baidu.com in the browser, and then if the network is normal, you can normally access the Baidu homepage. [0003] In fact, our computer will first access the DNS server on the Internet to query the IP address corresponding to the domain name www.baidu.com. Only after obtaining this IP address can the computer fill in the correct destination in the network request message. This destination is the server that provides the search engine servi...

AI Technical Summary

Problems solved by technology

[0004] If the target domain name cannot be accessed, it is difficult to determine the specific reason. It may be that the network configuration of the user's local host operating system is incorrect, such as filling in the wrong DNS server address, and the user's current network fails and cannot communicate with Internet communication, it may also be that the DNS server that provides domain name resolution services fails, and the IP address corresponding to the domain name cannot be resolved

This makes it impossible to quickly locate the problem

[0005] There is currently no effective solution to the problem that users cannot connect to the Internet to quickly locate faults in the prior art

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