Method, device and system for providing domain name resolution services

Abstract

In order to achieve the load balance of network access traffic, the invention discloses a method for providing domain name resolution services, belonging to the field of communication. The method comprises the following steps: receiving a DNS (domain name system) request message with a specified domain name, which is sent by a client, and forwarding the DNS request message to at least two DNS servers for domain name resolution, wherein the DNS servers belong to different ISPs (Internet service provider); receiving the response message of the IP (Internet protocol) addresses of each web server, which is acquired after the operation of the domain name resolution is conducted and returned by each DNS server; selecting on the principle that the load of each outlet is balanced from the acquired IP addresses of each web server according to the current free bandwidth of each outlet corresponding to each web server; and sending the selection results to the client. Accordingly, the invention can prevent the traffic from leaned to one side and achieve the load balance in the network system. The invention discloses an outlet gateway device, a DNS relay device and a communication system.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for providing domain name resolution services. Background technique [0002] DNS is short for Domain Name System, which is used to name computers and network services in hierarchies ranging from organizations to domains. On the Internet, there is a one-to-one or one-to-many relationship between domain names and IP addresses. Although domain names are easy for people to remember, each network entity can only rely on IP addresses to identify each other, and the conversion between domain names and IP addresses The work is called domain name resolution, and domain name resolution needs to be completed by a dedicated domain name resolution server, and the DNS server is a server dedicated to domain name resolution. In the Internet network based on the TCP / IP protocol, when a user enters the DNS name to check the computer or service item to be accessed, the...

AI Technical Summary

Problems solved by technology

[0012] At present, the DNS relay function of the egress gateway device can only forward the client's domain name query request to a configured DNS server served by an ISP. For example, as shown in Figure 2, the DNS server configured on the egress gateway device is Netcom DNS server, then all domain name query requests sent by clients will be forwarded to the Netcom DNS server. Therefore, each client will access the Netcom mirror server after receiving and analyzing the domain name resolution results returned by the Netcom DNS server link, so that The phenomenon of overwhelming traffic, that is, the bearer link based on Netcom ISP service is overloaded, while the bearer link based on Telecom ISP service is idle. Obviously, this will cause serious link load imbalance in the network, wasting network resources and at the same time , also affects the quality of network service

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