Inbound prefix filters

["John A. Tamplin" <jat () traveller com>]

On Tue, 11 Nov 1997, Phil Howard wrote:

> Sean M. Doran writes...
>
> [re: inbound filtering]
>
> > Sprintlink did at one point.  It's a really good idea to do
> > this in general because it mitigates the disconnectivity
> > customers assigned prefixes out of one's address blocks
> > will suffer if and when someone accidentally(?) announces
> > subnet of those blocks.
>
> Good point.

Actually, I view it the other way.  If someone is announcing routes for one
of our prefixes, connectivity is at least partially broken for that prefix,
and I want to know about it sooner rather than later.  If I see an 
advertisement for that route in our router, I can tell quickly who I need
to call.

BTW, this has happened to us twice, and both times the offender was a 
direct competitor in one of our local markets.  Does anybody have any 
feel for how often these "accidents" are not accidents?

John Tamplin                                    Traveller Information Services
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