@techreport{oai:ipsj.ixsq.nii.ac.jp:00216773,
 author = {Zhengxu, Jin and Yong, Jin and Nariyoshi, Yamai and Rei, Nakagawa and Zhengxu, Jin and Yong, Jin and Nariyoshi, Yamai and Rei, Nakagawa},
 issue = {17},
 month = {Feb},
 note = {Load balancing technology not only provides fault tolerance functionality but also can distribute access requests from the end clients to multiple web servers. An end client may receive multiple IP addresses for a web server during the DNS based domain name resolution which will be performed in prior to accessing the web server. In general, the end client will use the first IP address in the list to access the web server even it may cause high latency due to the long distance between the end client and the physical web server or the web server is in high workload. As a result, the Internet service providers cannot provide effective Internet services to the Internet users. In this paper, we propose an optimal selection mechanism from multiple IP addresses which can make the end client access the most proper web server in terms of causing low latency or being in low workload using Software Defined Network (SDN) technology. In the proposed mechanism, by using OpenFlow protocol, the OpenFlow controller makes the OpenFlow switch access the multiple IP addresses simultaneously when the end client attempts to access the first IP address and only replies the response from the most proper web server to the end client. Consequently, the end client will access the most proper web server transparently even there are multiple IP addresses available for the domain name of the web server. We implemented a prototype system for the proposed mechanism and evaluated the features on a local experimental network. The evaluation results confirmed that the prototype system worked correctly as designed and the performance was acceptable with reasonable overhead., Load balancing technology not only provides fault tolerance functionality but also can distribute access requests from the end clients to multiple web servers. An end client may receive multiple IP addresses for a web server during the DNS based domain name resolution which will be performed in prior to accessing the web server. In general, the end client will use the first IP address in the list to access the web server even it may cause high latency due to the long distance between the end client and the physical web server or the web server is in high workload. As a result, the Internet service providers cannot provide effective Internet services to the Internet users. In this paper, we propose an optimal selection mechanism from multiple IP addresses which can make the end client access the most proper web server in terms of causing low latency or being in low workload using Software Defined Network (SDN) technology. In the proposed mechanism, by using OpenFlow protocol, the OpenFlow controller makes the OpenFlow switch access the multiple IP addresses simultaneously when the end client attempts to access the first IP address and only replies the response from the most proper web server to the end client. Consequently, the end client will access the most proper web server transparently even there are multiple IP addresses available for the domain name of the web server. We implemented a prototype system for the proposed mechanism and evaluated the features on a local experimental network. The evaluation results confirmed that the prototype system worked correctly as designed and the performance was acceptable with reasonable overhead.},
 title = {An Optimal Selection Mechanism Using OpenFlow from Multiple IP Addresses in DNS Response},
 year = {2022}
}