RE: Who is announcing bogons?

["Stephen J. Wilcox" <steve () telecomplete co uk>]

On Mon, 28 Apr 2003, Sean Donelan wrote:

> 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.

But probably 50% or more of that is contained in large aggregatable blocks...

Steve

> 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.