Great Circle Associates Firewalls
(June 1997)
 

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Subject: Re: Stateful Packet Filters vs. Proxies
From: "Jamie Thain" <jthain @ cat . bbsr . edu>
Date: Sat, 7 Jun 1997 13:24:18 -0300
To: "Kelly E. Gibbs" <kgibbs @ best . com>, "Ryan Russell/SYBASE" <Ryan . Russell @ sybase . com>
Cc: "Bill Stout" <stoutb @ pios . com>, "firewalls" <firewalls @ GreatCircle . COM>

Kelly,

I would think a NAT works at layer 3. It cannot be 4, as that is where
TCP/UDP resides and a NAT works on IP address (at least firewall-1's) 

Layer three is described in part as... 

Finding a route between a source and a destination node or between two
intermediate devices. 

The Network Press, Encyclopedia of Networking, Pg 753 (OSI Models) 

regards:jamie





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