Great Circle Associates Firewalls
(August 1997)
 

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Subject: Gauntlet Performance
From: rwm <rmcm001 @ us . net>
Date: Thu, 28 Aug 1997 23:22:48 -0400
To: firewalls @ greatcircle . com

I am reviewing an architecture where a TIS Gauntlet (version 3.2a) is
employed in a rather significant packet filter role which I suspect it
is not really designed for. The platform is a SPARC Ultra 170e.  I am
concerned that bandwidth degregation will be significant if I employ
over 50 filter lines on "inside" and "outside" interfaces. 

Q1:  Does anyone know of any empirical data showing the relationship
between number of filter lines and throughput?  
(I am aware of data depicting a throughput drop off when more than 48
connections are maintained, however, this is a performance issue
concerning only the application proxy - not the packet filter) 

Q2:  Has anyone employed multiple Gauntlet's in parallel with them
running OSPF (gated) in an effort to increase performance?  I am trying
to determine that if a Gauntlet is overburdened with the processing
associated with packet filtering  a large number of packets, that the
"network" will be aware of this and cause OSPF load balancing to occur. 
I lack the background in the details of how the OS kernel would process
these packets (Gauntlet compiles the packet filter lines in the OS
kernel).

Thanks in advance

rwm


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