Re: Arguing against using public IP space

[Jay Ashworth <jra () baylink com>]

---- Original Message -----
> From: "Doug Barton" <dougb () dougbarton us>

> On 11/13/2011 13:27, Phil Regnauld wrote:
> >     That's not exactly correct. NAT doesn't imply
> >     firewalling/filtering.
> >     To illustrate this to customers, I've mounted attacks/scans on
> >     hosts behind NAT devices, from the interconnect network immediately
> >     outside: if you can point a route with the ext ip of the NAT device
> >     as the next hop, it usually just forwards the packets...
>
> Have you written this up anywhere? It would be absolutely awesome to
> be able to point the "NAT IS A SECURITY FEATURE!!!" crowd to an actual
> demonstration of why it isn't.

Accepting strict source routing from a public interface is certainly in the
top 10 Worst Common Practices, is it not?  (IE: I would be surprised if *any*
current router actually let you do that.)

Cheers,
-- jra
-- 
Jay R. Ashworth                  Baylink                       jra () baylink com
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