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It's not malicious; it's just normal ARP traffic you'll find on any IPv4 network. The host with the Sercomm Corporation OUI (D4-21-22) is attempting to find out which host has a particular IP address, and this is the mechanism by which it accomplishes that.

See also: https://en.wikipedia.org/wiki/Address_Resolution_Protocol

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It's not malicious; it's just normal ARP traffic you'll find on any IPv4 network. The host with the Sercomm Corporation OUI (D4-21-22) is attempting to find out which host has a particular IP address, and this is the mechanism by which it accomplishes that.

See also: https://en.wikipedia.org/wiki/Address_Resolution_Protocolthe Wikipedia article on ARP.