North American Network Operators Group

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Re: Where NAT disenfranchises the end-user ...

  • From: Scott Gifford
  • Date: Mon Sep 10 15:03:56 2001

Roeland Meyer <[email protected]> writes:


> Firewalls aren't accidents.  NAT address propogation failures are,
> they are not consistent, and can't be relied upon to continue.  Who
> knows, some genius, somewhere, may fix it tomorrow. Lord knows,
> there is sufficient incentive to do so. If that happens, your
> security is toast, if all you are relying on is NAT, rather than
> putting up a real firewall.

The rest of what you're saying makes sense, but I just don't buy

A clever design might allow NAT to work with all protocols and in both
directions, which would have increased connectivity but decreased
security.  But how would it get onto my network without me putting it
there, and presumably configuring it securely?  The box doing NAT is
under my control...