Proxy vs. NAT

[Stan Anderson <Stan () iconfitness com>]

Why would I want to use proxy on my firewall instead of a NAT or vice versa.
I recently moved to IBM's e-Network Firewall for AIX, and can't see any
reason not to use NAT.  On our old firewall if you didn't use proxy, you
couldn't log the activity as well.  Please help me, I just may not
understand the difference.

        
        Thanks,
          Stan Anderson
          ICON Health & Fitness, Inc.
          (435) 750-7795