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For containers the link is effectively always up, but for virtual and physical machines networkd may have started before the link has gained carrier. Networkd will configure addresses when carrier is gained, but should also configure addresses if the link is already up. Without this patch the addresses are set unconditionally. Normally this isn't a problem since addresses are either fixed, set over DHCP, or is never without carrier. But for machines that gain carrier and are configured to select an address from the unallocated local address pool this causes them to pick an address from the pool twice. This change to skip address configuration when a link is added before it has a carrier fixes having multiple addresses assigned if the machine starts networkd before it has gained carrier and is configured with an address from the pool.
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