Difference between revisions of "NAT"
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Network Address Translation (NAT) is used to translate the source or destination of an [[IP]] packet as a policy at a [[router]] or [[firewall]]. NAT implementations have to keep a state in order to identify where to translate return traffic to. Imagine a network that uses private networks ([[RFC]] 1918) and needs to speak to the public Internet. The gateway has a public IP address and needs to change source addresses from the private network to it, and return traffic must be translated back. | Network Address Translation (NAT) is used to translate the source or destination of an [[IP]] packet as a policy at a [[router]] or [[firewall]]. NAT implementations have to keep a state in order to identify where to translate return traffic to. Imagine a network that uses private networks ([[RFC]] 1918) and needs to speak to the public Internet. The gateway has a public IP address and needs to change source addresses from the private network to it, and return traffic must be translated back. | ||
| − | '''NAT''' is a workaround implemented due to IP version 4 address space shortages. IP version 6 should hopefully bury this hack. | + | '''NAT''' is a workaround implemented due to IP version 4 address space shortages. IP version 6 should hopefully bury this hack (it hasn't see [[natally]]). |
Programs that do NAT are a series of [[firewall]]s, [[natd]], [[ppp]]. | Programs that do NAT are a series of [[firewall]]s, [[natd]], [[ppp]]. | ||
Latest revision as of 11:12, 15 December 2011
Network Address Translation (NAT) is used to translate the source or destination of an IP packet as a policy at a router or firewall. NAT implementations have to keep a state in order to identify where to translate return traffic to. Imagine a network that uses private networks (RFC 1918) and needs to speak to the public Internet. The gateway has a public IP address and needs to change source addresses from the private network to it, and return traffic must be translated back.
NAT is a workaround implemented due to IP version 4 address space shortages. IP version 6 should hopefully bury this hack (it hasn't see natally).
