Configuring the system to disable IPv6 source routing protects against spoofing.
To fix this, configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> "MSS: (DisableIPSourceRouting IPv6) IP source routing protection level (protects against packet spoofing)" to "Highest protection, source routing is completely disabled".
This policy setting requires the installation of the MSS-Legacy custom templates. "MSS-Legacy.admx" and " MSS-Legacy.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively. Files can be found here: https://www.microsoft.com/en-us/download/53430