Linux has included an IPv6 protocol stack for a long time. Its quality, however, was not quite good at the early stage. The USAGI Project was founded to promote this situation and pro­vide high quality IPv6 stack for Linux systems. As a result of 5 years of our intensive activity, our stack is now certified as IPv6 Ready. It has been merged into main­line kernel so that the Linux IPv6 stack has enough quality to get the IPv6 Ready Logo now. To maintain the stack stable, we developed an automatic testing sys­tem, which greatly helps us saving our time. In this paper and the relevant presentation, we will show our efforts and technology to get the Logo and to maintain the quality of kernel. In addi­tion, we will discuss our future plan.

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