Where are static bogon filters appropriate? was: Bogons

Steven M. Bellovin smb at cs.columbia.edu
Fri Mar 2 02:08:59 UTC 2007

On Thu, 01 Mar 2007 14:22:37 +0000 (GMT)
"Chris L. Morrow" <christopher.morrow at verizonbusiness.com> wrote:

> On Thu, 1 Mar 2007, Jon Lewis wrote:
> > On Wed, 28 Feb 2007, Eric Ortega wrote:
> >
> > > I'd like to thank the group for the responses and help with this
> > > issue. I find it ironic that Randy's study actually uses 96 space.
> >
> > The amazing/sad thing is that people have been facing and fixing
> > the same problem for more than 4 years.  How many times does a
> > network have to fix their static bogon filters before coming to the
> > realization that those filters are a bad idea?
> So, where are static bogon filters appropriate? (loaded question
> perhaps) I ask because just about every 'security expert' and
> 'security whitepaper' or 'security suggestions' has some portion that
> speaks to "why it's a grand idea to have acl-lines/firewall-policy tp
> block 'bogon' ip space" (for some definition of 'bogon' of course).
Well, not all of us advocate that; see

		--Steve Bellovin, http://www.cs.columbia.edu/~smb

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