NAT


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NAT

NAT

On drawings, abbr. for “natural.”

NAT

(Network Address Translation) The technology that maintains the privacy of the addresses of the computers in a home or business network when accessing the Internet. It converts the private addresses that are assigned to the internal computers to one or more public addresses that are visible on the Internet (see private IP address). NAT is an IETF standard that is implemented in a router or firewall as well as in any user's machine that is configured to share its Internet connection (see ICS).

NAT assigns a number to the packet headers of the messages going out to the Internet and keeps track of them via an internal table that it creates. When responses come back from the Internet, NAT uses the table to perform the reverse conversion to the private IP address of the requesting client machine (see illustration below).

A First-Level Firewall
NAT enhances security by keeping internal addresses hidden from the outside world. It prevents several kinds of first-level attacks, but not all, and must be used in conjunction with the firewall built into the router or the personal firewall in each user's machine. Enterprises generally use very robust firewall architectures for security (see firewall). See dynamic NAT.


NAT Port Address Translation (PAT)
This common NAT method assigns a different TCP port number to each client session with a server on the Internet. When responses come back, the source port becomes the destination port and determines which user to route the packets to. It also validates that the incoming packets were requested. See TCP/IP port.
References in periodicals archive ?
Sally and Neil selected their outfits on Friday during what was one of their first trips out from their home in Jesmond without Nat.
In recognition of Nat's contribution to journalism and what he stood for, the Nieman Society of Southern Africa, the South African National Editors Forum (Sanef), and the Print and Digital Media of South Africa (PDMSA) established South African journalism's highest honor, the Nat Nakasa Award for Courageous Journalism, which is awarded annually to a media practitioner such as a journalist, editor, manager, or owner who has shown integrity, reported fearlessly, and displayed a commitment to serve the people of South Africa.
We now have a stable, secure and standard foundation for deploying AnyFirewall Engine and Server for guaranteed firewall and NAT traversal into VoIP, video conferencing and many other Internet applications and services.
Nat, how do you feel about large 3-piece acrylic riser sets?
Upon completion of the deal, which is seen to occur in January 2013, Scandic will become a wholly owned subsidiary of NAT.
NAT will establish its first full-scale facility in Pamplico, SC, where flax is grown nearby as a winter crop.
James Hannam - organiser of Nat Night and also known as electronica wunderkind Culprit 1 "I met Nat through mutual friends in late 1999 at The Wharf in Cardiff Bay.
Countries that have not yet adopted NAT may use the traditional method for screening blood donations, known as immunoassay (or serology) testing.
It has been a culinary journey without compromise - well, only one, which we will come to - and Nat is proud to say that he has never dumbed down his cuisine.
BIRMINGHAM may be blessed with some terrific Indian restaurants but it was a very different culinary landscape when Nat Batt unleashed his authentic rogan josh almost 38 years ago.
Races induced a higher lactate concentration increase in NAT compared to COL (10.
Nat the Nantucket Cat, an adorable grey-and-black tabby, is hiding somewhere in each of the pictures packed with scenes of events and special places in Nantucket, from the Daffodil Festival to a crowded day on Main Street to Fourth of July fireworks on Jetties Beach.