Is it time to abandon bogon prefix filters?

Tue Aug 26 07:28:04 UTC 2008

On Sun, 24 Aug 2008, Tomas L. Byrnes wrote:
> You're missing one of the basic issues with bogon sources: they are
> often advertised bogons, IE the bad guy DOES care about getting the
> packets back, and has, in fact, created a way to do so.
>
> This is usually VERY BAD traffic, and EVEN WORSE if a user goes TO a
> site hosted in such IP space.
>
> So, Bogon filtering has value beyond mere spoofed source rejection.

Unmanaged (or semi-managed) routers probably should not be running
BGP or other exterior routing protocols.  Unmanaged routers with BGP
provide more opportunities to create havoc and mischief.