North American Network Operators Group
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RE: Who is announcing bogons?

  • From: Sean Donelan
  • Date: Mon Apr 28 22:41:23 2003 
On Mon, 28 Apr 2003, McBurnett, Jim wrote:
> I am not a BGP Guru by any means but as I see it:
> there are more than 25 /8 that should not be routed at all...
> And they are easily summarized.. some can be /6 or less...
> I never tried that.. But should work....

If Rob wanted to do it right :-)

In 2001, approximately 33.5% of IPv4 address space was being announced
in the global routing table.  If you wanted to do complete negative
filtering, you need to filter 66.5% of the IPv4 address space.

http://www.apnic.net/stats/bgp/TOTAL/totaladd.html

Unfortunately, all we have is a rather blunt tool.  Its a bit like
trying to fight credit card fraud by rejecting any card that doesn't
begin with a 4 (Visa) or 5 (partial Mastercard range).  It may work as
a limited data entry check, but its not enough.