Great Circle Associates Firewalls
(December 1997)
 

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Subject: NAT vs. transparent proxie
From: "Martin Esslinger" <esslinger @ bigfoot . com>
Date: Mon, 29 Dec 97 01:11:09 +0100
To: "firewalls @ greatcircle . com" <firewalls @ greatcircle . com>
Reply-to: "Martin Esslinger" <esslinger @ bigfoot . com>

Hello everybody,

I have some trouble evaluating between a transparent proxy and NAT, assuming that I 
need 1: m NAT (or  just masquerading) on a non registered LAN.

Both seem to accomplish the same, no modified user or client procedures and they look 
like a single host to the outer world.

NAT only sees the protocol level, a proxy can also do application level. (Actually what is 
the diffenence between transparent socks and masquerading?).  

If I don´t want to do caching, logging or inbound services is there a reason to prefer 
transparent proxies  from a security (or any) point of view?

thanks

                     Martin











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