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Looking at the output of ifconfig or ip link show. Can an interface status be UP/RUNNING/active without an IP address assigned to it?

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Yes, it can be UP and RUNNING without an IP address. This can even be useful, e.g. if you are just interested in sending/receiving layer 2 frames, or if you are running a different layer 3 protocol than IP.

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    Or if you're about to broadcast a DHCP request. – waltinator Dec 28 '17 at 23:48

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