Great Circle Associates Firewalls
(October 1997)
 

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Subject: Re: sex, lies, and firewall code
From: Ryan Russell/SYBASE <Ryan . Russell @ sybase . com>
Date: 20 Oct 97 17:47:43 EDT
To: Bill Stout <stoutb @ pios . com>
Cc: firewalls <firewalls @ GreatCircle . COM>

>Lies:
>It is a misrepresentation to say that state-based filtering mechanisms
>provide security anywhere near the superior security offered by proxy-based
>firewalls.  My biggest beef with 'state-based firewalls' is that a
>state-based filter cannot rewrite packets, it passes packets through,
>leaving the internal network exposed to various packet attacks.  A
>state-based filter also does not have the application code to intelligently
>filter application commands.  

Now there's an appropriatly named paragraph :)

Now, do you mean "can't" or "don't" ?  Naturally, a SPF *can* do anything
that a proxy could.  It has the whole packet, it can do whatever it wants
to with it.  It can re-write the whole packet, and can have any application
code desired to filter anything.

If you meant to state that the current SPF implementations don't filter
much, that is a bit more correct.

    Ryan


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