Using Arpwatch version 2.1a13-2.1 on a dual NIC host that performs routing and a few services for a three stations LAN, I have also encountered surprisingly high CPU usage - arpwatch was competing with other running processes to hog the whole single core CPU. Restarting arpwatch solved the problem. I don't know how long arpwatch had been running wild - probably a few days at least, and I do not know what triggered this behavior either.
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