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A number of unfortunately confusing terms are associated with NAT that in a typically evil plot are usually testable.
The terms you need to be familiar with are as follows:

• Inside: This refers (typically) to the private side of the network, usually the source of addresses that are being translated.

• Outside: This is typically the public side of the network, the address space to which inside hosts are being translated.

• Inside Local: These addresses are assigned to inside hosts and are the ones being translated. Inside Local IPs are often RFC 1918 private IPs such as 192.168.x.x, 172.16–31.x.x and 10.x.x.x, but this is by no means a requirement.

• Inside Global: These are the addresses to which Inside Locals get translated; often registered IPs obtained from the ISP.

• Outside Global: These are typically registered IPs assigned to web servers, mail servers, or any host that is reachable on the public network (Internet, usually) itself.

• Outside Local: These are the addresses of Outside Global hosts as they appear on the Inside network; they might or might not have been translated from Outside to Inside, depending on the configuration.

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Posted by steve10

www.webopedia.com/TERM/N/NAT.html

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Posted by crouse