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* netutils: Add method to verify if IPv6 Address is EUI-64 By checking if ff:fe is present in the address we can see if an IPv6 Address is EUI-64 or not. Signed-off-by: Wido den Hollander <wido@widodh.nl> * ipv6: Do not allow a Secondary IPv6 address to be EUI-64 EUI-64 addresses should not be allowed as they can be used in the future by a to be deployed Instance which has to obtain this address because it matches it's MAC. In a /64 subnet there are more then enough other IPs available to be allocated to Instances, therefor we can safely disallow the allocation of EUI-64 addresses. Signed-off-by: Wido den Hollander <wido@widodh.nl>