This arose on the ntop mailing list, and I tracked it down to gen_broadcast in libpcap. The problem arises with a promiscuous NIC listening to an overlaid network (where the packets seen include addresses outside the NIC's configured subnet).

Executive summary: gen_broadcast(ETHERNET_IP) should include a term that matches the network part of the address to that of the interface.

<http://listgateway.unipi.it/pipermail/ntop/2005-June/010550.html>
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