Congestion controller and method for controlling congestion of network

Abstract

This invention efficiently restricts access to high-load web servers on an IP network, improves total throughput, and prevents web server and system stoppage and failures, while at the same time improving user service efficiency. After storing the association between IP addresses and host names into a memory, the congestion controller installed on the IP network controls a DNS server to acquire the IP address of a web server when a request is issued from a client to the web server, then if the web server of the IP address is judged to be congested, searches for another IP address of a non-congested web server associated with the same host name included in the memory-stored association, and forwards the client-issued request to the web server of the new IP address.

Description

technical field [0001] The present invention relates to a congestion control device for relaying communication between a client computer and a Web server and a network congestion control method, and particularly relates to a congestion control method suitable for use when a Web server is composed of Web servers with multiple IP addresses by DNS round-robin method. A congestion control device and a network congestion control method. Background technique [0002] With the rapid spread of the Internet, information provision and various services through the Internet have become closer to us. In addition, not only PC terminals but also mobile terminals can quickly access, and with the increase of mobile users, access to Web servers tends to increase. [0003] In such an Internet environment, in an existing method in which each user directly accesses a Web server, access to a specific Web server, for example, a Web server that provides services such as ticket reservations, securi...

AI Technical Summary

Problems solved by technology

[0009] In the prior art described above, the congestion control device has the problem that when it is determined that one of a plurality of Web servers is in a congested state using the DNS round-robin method when controlling and managing congestion in units of IP addresses, For example, if the host name of a certain Web server is composed of n Web servers, in the DNS address resolution request for access from the client, the IP of the Web server that is judged to be congested once out of the n times is returned. address, when the IP address is in a congested state, a limit message is returned to one of the n requests for the host name, and the service efficiency for the user is reduced

[0010] In addition, on the client side or the DNS server side, in order to monitor the load status of multiple Web servers based on the DNS round-robin method all the time or periodically, and return the IP address of the server with the lowest load in order for the address resolution request, it is necessary to check each The load status of each Web server, so it is necessary to perform a certain communication all the time or periodically. In the case where there are multiple Web servers, there is an increase in the load for the management of the load status of each Web server, or when communication due to the load check is caused network congestion problem

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