contribution to national measurement priorities challenges in Internet measurements `12-step program': step 3-5, 9-10, 12 NSF ANIR PI meeting Jan 2003 http://www.caida.org/publications/presentations/nsfpi200301/ (9) discovering pervasive hidden bugs any modeling or analylsis must handle impact of this huge component of traffic (10) how does measurement affect/support security goals infer bgp, firewall, and virus spread behavior how do you get networks to share security-related information protection of measurement infrastructure from security compromises (12) encouragement of strategic measurement in new networks based on what we learned from what we did wrong in old networks