tracking a metamorphic infrastructure: observations on our (in)ability to accurately predict, analyze or even measure conditions on the global Internet 25 may 2000 sane 2000 maastricht.nl scientific apparatus offers a window to knowledge, but as they grow more elaborate, scientists spend ever more time washing the windows. -- Isaac Asimov kc claffy, UCSD/SDSC/CAIDA kc@caida.org www.caida.org