For the archives... Apparently, arping forked at some point. The fork that stayed in iputils does not do MAC-to-IP resolution for some bizarre resolution. The answer seems to be to get a different arping from:
http://www.habets.pp.se/synscan/programs.php?prog=arping -- *********************************************************************** * John Oliver http://www.john-oliver.net/ * * * *********************************************************************** -- KPLUG-List@kernel-panic.org http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list