% Registration Linux Is Now IPv6 Ready % [2]Register/Submit Hideaki Yoshifuji (yoshfuji@linux-ipv6.org) Linux has included a IPv6 protocol stack for a long time. Its quality, however, was not quite good. The USAGI Project was founded to provide high quality IPv6 stack in Linux. After 5 years of our activity, our stack is now certified as IPv6 Ready. Our efforts has been merged into main-line kernel and Linux IPv6 stack has enough quality to get the IPv6 Ready Logo now. To maintain our stack stable, we developed an automatic testing system and it greatly helps us saving our time. In this paper and presentation, we will show our efforts and technology to get the Logo and maintain the quality of kernel. In addition, we will discuss our future plan.