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Static/dynamic/overloading NAT and PAT understanding

Posted on 2013-01-11
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Struggling a bit with the understanding of static/dynamic/overloading NAT and PAT so please correct me if this is wrong:

- Static NAT = one internal IP to one external IP (and maybe a few occurrences of this on the same router), more expensive and less common.
- dynamic NAT and PAT = basicly mapping one external IP address to many different internal hosts IP addresses and differentiating them with use of port numbers.
- now is NAT overloading the same as the latter also?

Many thanks
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Question by:Johny_Brav0
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fgasimzade earned 500 total points
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Stastic - correct

dynamic NAT (no overloading) - mapping many inside hosts to a list of external ip addresses. When the list of external ip addresses is exhausted, mapping does not occur, in other words new internal ip address do not map

NAT overloading or PAT - basicly mapping one external IP address to many different internal hosts IP addresses and differentiating them with use of port numbers.
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http://www.cisco.com/en/US/tech/tk648/tk361/technologies_q_and_a_item09186a00800e523b.shtml

What is meant by the term NAT overloading; is this PAT?

    A. Yes. NAT overloading is PAT, which involves using a pool with a range of one or more addresses or using an interface IP address in combination with the port. When you overload, you create a fully extended translation. This is a translation table entry containing IP address and source/destination port information, which is commonly called PAT or overloading.

    PAT (or overloading) is a feature of Cisco IOS NAT that is used to translate internal (inside local) private addresses to one or more outside (inside global, usually registered) IP addresses. Unique source port numbers on each translation are used to distinguish between the conversations.

Q. What are dynamic NAT translations?

    A. In dynamic NAT translations, the users can establish dynamic mapping between local and global addresses. Dynamic mapping is accomplished by defining the local addresses to be translated and the pool of addresses or interface IP address from which to allocate global addresses and associating the two.
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