Abstract
Load balancing among multiple web servers by using DNS is called DNS round-robin. In the DNS round-robin, the DNS server has multiple IP address entries for the single host name which corresponds to the URL, and returns an IP address in a round-robin fashion whenever it receives a query of address resolution. However, due to a non-weighted pure round-robin service and an address cache mechanism in the client-side DNS server, there are many cases that load balancing does not work effectively. To realize an effective load balancing, a previous work has adjusted the TTL (Time To Live), the caching period of address information. This paper enhances the TTL calculation method to achieve a more effective load balancing.
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