Requires libpcap from ftp.ee.lbl.gov, and libnet 0.10 or later from
http://www.packetfactory.net/libnet.  This package is known to work
with libnet versions through 0.99g.
It should work with libnet 1.0 if you fix the typo in 
libnet/libnet-headers.h where ARH_H instead of ARP_H is defined to
LIBNET_ARP_H.

May require get_hwaddr to be implemented for your system type for Libnet.
get_hwaddr should work for at least Linux and Solaris.
