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It's a conceptual question:

Suppose i want to separate NAT and firewall, can it help to my security?

INTERNET >>>> NAT >>>> Firewall >>> MyNetwork

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  • Are you talking about using NAT overloaded as a security measure?
    – No Time
    Aug 8, 2014 at 2:37
  • yes, want to impelement defense in depth.
    – PersianGulf
    Aug 8, 2014 at 16:44

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I don't think it would make much of a difference. NAT has nothing to do with security and the firewall should be your primary defense.

Having a device provide both firewall and NAT services isn't a security risk by itself. The only potential security risk would be the software and configuration of the device. Since there are so many vendors/products on the market and questions about products is disallowed, this cannot be answered anyways.

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