?
Solved

Static/dynamic/overloading NAT and PAT understanding

Posted on 2013-01-11
2
Medium Priority
?
562 Views
Last Modified: 2013-01-14
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
0
Comment
Question by:Johny_Brav0
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
2 Comments
 
LVL 18

Accepted Solution

by:
fgasimzade earned 2000 total points
ID: 38766712
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.
0
 
LVL 18

Assisted Solution

by:fgasimzade
fgasimzade earned 2000 total points
ID: 38766715
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.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Quality of Service (QoS) options are nearly endless when it comes to networks today. This article is merely one example of how it can be handled in a hub-n-spoke design using a 3-tier configuration.
As companies replace their old PBX phone systems with Unified IP Communications, many are finding out that legacy applications such as fax do not work well with VoIP. Fortunately, Cloud Faxing provides a cost-effective alternative that works over an…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question