Re: Air Gap vs. firewall

[Joseph S D Yao <jsdy () cospo osis gov>]

On Thu, Sep 21, 2000 at 04:39:35PM +0000, a burbatsky wrote:
> I am trying to get a handle on the difference between an air gap appliance 
> and a firewall.
>
> In an article in Information Security magazine, 
> (//www.infosecuritymag.com/july2000/coverstory.htm)the article defines the 
> following:
>
> “A firewall is the logical disconnection of two physically connected net 
> works, while a gap is a physical disconnection of two logically connected 
> networks.”
>
> Is this semantics or is there a real difference between the two?

Logical:

             _____
---------NIC|_____|NIC---------
             ^Proxy servers block IP flow and initiate new connections
              on the other side.  NO IP FLOW AT ALL between sides.

Physical:

             _____             _____
---------NIC|_____|  floppy   |_____|NIC------

-- 
Joe Yao                         jsdy () cospo osis gov - Joseph S. D. Yao
COSPO/OSIS Computer Support                                     EMT-B
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