Hidenari Sawashima <hidena-s@is.aist-nara.ac.jp> Nara Institute of Science and Technology Japan Yoshiaki Hori <hori@kyushu-id.ac.jp> Kyushu Institute of Design Japan Hideki Sunahara <suna@wide.ad.jp> Yuji Oie <oie@itc.aist-nara.ac.jp> Nara Institute of Science and Technology Japan Abstract On wide area networks (WANs), UDP has likely been used for real-time applications, such as video and audio. U