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The fear of incompatibility issues between legacy IPv4 systems and new IPv6 implementations can delay the migration towards a full IPv6 native Internet. Network engineers need to ensure that heterogeneous IPv6 devices behaves consistently to the IPv6 specifications and correctly enterprise in a multi-vendor environment. This paper analyzes IPv6 conformance testing, a set of rigorous test methodologies that allows to throughout verify the quality of IPv6 devices during their entire life cycle, and can give confidence to the customers. We analyze the TAHI IPv6 conformance and interoperability test suite and present our conformance test results for the latest versions of IPv6 host implementations.