Hello Bob,
Nat does hide details of your inside network, it may also slow an attacker down but it wont stop reconnaissance attacks, determine the ip ranges of your site, what host/services are available via port scanning.
If the hacker has the expertise they could do a lot of harm with all this information, that why we should use all the necessary tools available to us to try and avoid or at least make it much harder for them to gain access to that information.
NAT should be deemed as a very very weak form of security.
res
Paul
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Kind Regards
Paul