Re: Ok; let's have the "Does DNAT contribute to Security" argument one more time...

[Valdis.Kletnieks () vt edu]

On Mon, 14 Nov 2011 15:55:14 EST, Jay Ashworth said:

> On the other hand, since a firewall's job is to stop packets you don't want,

One of Marcus Ranum's "5 Stupidest Security Blunders" - "enumerating badness".
A firewall's job isn't to stop unwanted packets, it's to pass only wanted packets.

> if it stops doing it's just as a firewall, it's likely to keep on doing it's
> other job: passing packets.

As a result, a firewall that fails open rather than closed is mis-designed.

And if you're deploying a firewall and don't know if the failure mode is open or
closed, you probably get what you deserve when it fails.

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