Security Basics mailing list archives

Re: Firewall and DMZ topology


From: "Chris Berry" <compjma () hotmail com>
Date: Tue, 10 Jun 2003 14:18:19 -0700

From: "Steve Bremer" <steveb () nebcoinc com>
> Under what conditions would these firewalls be configured any
> differently from a vulnerability-assessment view point?  i.e., if
> someone was able to crack the outer firewall, is it not likely they
> would crack the inner firewall as well?

Not necessarily.  If different types of firewalls are used for each, the
chance of both being compromised has been significantly reduced.
However, a poorly implemented filtering policy applied to both
firewalls could still allow unwanted traffic *through* them.

In theory yes, however, if your administration isn't perfect, it would actually LOWER your security stance. Kind of goes against the KISS principal unless you have enough staff/time to keep a close eye on it. Guess it all depends on your size.

Chris Berry
compjma () hotmail com
Systems Administrator
JM Associates

"Gold is for the mistress - silver for the maid
Copper for the craftsman cunning in his trade.
"Good!" said the Baron, sitting in his hall
But steel - cold steel is master of them all." -- Rudyard Kipling

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