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Do you have a machine on your network that has a matching MAC address? Is Eth1.3900 a wired or wireless ethernet interface?– Nevin WilliamsCommented Feb 18, 2017 at 21:38
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The only five first numbers (5c ...) are identical to my Zyxel router mac address. eth1.3900 is a wired ethernet interface.– BertaudCommented Feb 18, 2017 at 23:22
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