Difference between NAT and NAPT

NAT vs NAPT

Network Address Translation (NAT) is the process that changes the IP address in the header of an IP packet as it travels through a routing device. NAT allows one set of IP addresses to be used for traffic within a local area network (LAN) and another set of IP addresses for traffic outside. The one-to-one transformation of IP addresses is provided by the simplest form of NAT. NAPT (network address and port translation) is an extension of NAT that allows you to map multiple IP addresses to a single IP address. This is done with the help of TCP and UDP port information in outbound traffic.

What is NAT ??

Network address translation changes the IP address in the header of an IP packet while it is traveling through a routing device. NAT allows one set of IP addresses to be used for traffic within a local network and to another set of IP addresses for traffic outside. The one-to-one transformation of IP addresses is provided by the simplest form of NAT. NAT has several advantages. It improves the security of a local network because it offers the possibility of hiding internal IP addresses. In addition, since IP addresses are used only internally, this will not cause any conflict with IP addresses used in other organizations. In addition, the use of an Internet connection for all computers a local network is made possible by NAT. NAT works with the use of a NAT box located in the interface where the LAN is connected to the Internet. It contains a set of valid IP addresses and is responsible for translating IP addresses.

What is a NAPT ??

NAPT (network address and port translation) is used to map a set of private IP addresses using a single public IP address or a small group of public IP addresses. NAPT is also called PAT (port address translation), IP masquerading, NAT overload and many-to-one NAT. In NAPT, many IP addresses are mapped to a single IP address. This would create ambiguity when routing returned packets. To avoid this problem, NAPT uses the TCP / UDP port information of outgoing traffic and maintains a translation table. This would allow packets returned to the requestor to be routed correctly.

What is the difference between NAT and NAPT?

NAT changes the IP address in the header of an IP packet as it traverses a routing device and allows a different set of IP addresses to be used for traffic within a local network than that defined for external traffic. NAPT is a special type of NAT in which multiple private IP addresses are mapped to a single IP address or to a small group of public IP addresses. Therefore, NAPT involves multiple translation of IP addresses. NAPT is the most used NAT. Therefore, most of the time, NAPT is called NAT.

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