Use of Default in the DFZ: banned in philly, see it now on the net!

From: Randy Bush (no email)
Date: Tue Jun 23 2009 - 15:51:01 EDT

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    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


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