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IP NAT Address Terminology
(Page 3 of 3)
Graphical Illustration of NAT Terminology
And after all that… it's still
confusing. J
One of the big problems is that the words “inside” and “local”
are somewhat synonymous, as are “outside” and “global”,
yet they mean different things in NAT. And the typical paradox in trying
to explain networking concepts rears its ugly head here again: I wanted
to define these addresses to make describing NAT operation easier, but
find myself wanting to use an example of NAT operation to clarify how
the addresses are used.
Even after writing this section I
find these terms confusing, so I created Figure 111,
which shows this same terminology in graphical form and may be of some
help. That diagram is also used as a template for the illustrations
of each of the different types of NAT in subsequent topics, which use
the same color coding for each of the four address types for consistency.
As you read the topics that discuss NAT operation, remember to look
back here if you want to double-check the meaning of address types.
Don't get discouraged if it takes a couple of times to get the addresses
straight.
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