Anycast is defined as one of new IPv6 features, which supports service-oriented address assignments in IPv6 networks. Anycast address is not determined by the location of node, but by the type of service presented at the node. In anycast communication, the client can automatically obtain the appropriate node corresponding to a specific service without knowledge of the location of the server. However, there are some technical problems to be solved in the current anycast definitions. In this paper, we first clarify such restrictions in anycast communications, and then design a new architecture for anycast communications so that every application can support anycast communications without any modifications of their program. We have implemented our designed architecture on the UNIX-based operating system, and verified that our proposed method smoothly supports anycasting without change of existing applications.
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