Great Circle Associates Firewalls
(April 1997)
 

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Subject: Re: Proxy vs. Stateful Inspection
From: Darren Reed <avalon @ coombs . anu . edu . au>
Date: Sat, 26 Apr 1997 17:07:40 +1000 (EST)
To: dewaald @ sprynet . com (Dan DeWaal)
Cc: Firewalls @ GreatCircle . COM
In-reply-to: <199704241223 . FAA02454 @ m9 . sprynet . com> from "Dan DeWaal" at Apr 24, 97 07:22:28 am

In some mail from Dan DeWaal, sie said:
> 
> I'm looking for opinions on MLSI (Multi-Layer Stateful Inspection) vs. 
> application gateway firewall architecture.  We are in the process of
> selecting 
> an internal firewall and may have to choose between these technologies.

I've yet to see a product or hear of a product which does MLSI perfectly.
(Yes, what that means is that products which do it are `forced' to make a
 number of assumptions about things which can lead to the product not
 behaving as one woudl expect).

It is much easier to turn a application gateway into a transparent proxy
and have that work 100% than it is for MLSI to be 100% - IMHO.

I'd trust the application gateway before the MLSI.

Darren


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