due to nanog pc silliness, my lightning talk on $subject was not given in philly. i had promised to report to nanog the results of our winter experiment which used as path poisoning. here is the lightning talk i would have given. http://archive.psg.com/090615.nanog-default.pdf this is really meant to be a talk, so the slides can be a bit hard. on slide 6 /20 is the as path length of a /20, i.e. a 'normal' distribution, as seen from bgp monitors at RV, RIS, and a jillion others /25 is the as path length distribution we saw pinging from the /25 BGP is the as path length distribution we saw from RV/RIS i.e. BGP views are significantly skewed. but most of us knew that. on slides 10 and 11, the categories stub, small isp, large isp are from a ucla study. imiho, you should take them with a grain of salt. on 12, the reason for the funniness around 30 test points is because, we really wanted >= 30 test points in an AS. so if we got close, we scanned harder to find them. please do check your as at <http://psg.com/default/> and then actually look at your router config. i found one of my routers still had a default from when i was bringing it up. randy