After several IPv4 address exhaustion milestones we passed the last years, it is clear that there is a need to adopt to the next generation internet protocol IPv6. An IPv6 enabled host can have multiple addresses and the underlying paradigm of address configuration has changed. To select a source address in IPv6, the operating system implements a source address selection mechanism that compares multiple source address candidates and selects the best candidate. Criteria for this selection are defined in RFC6724. In this paper, we analyze the behavior of the IPv6 source address selection mechanism of different operating systems and check if they work compliant to RFC6724. As the source address selection might differ in different networks with distinct configurations, we set up multiple scenarios with different network configurations for our experiments. Our lab setup consists of state-of-the-art operating system at the latest patch level.