Differences

Difference between NAT and PAT

Main Difference between NAT and PAT

The main difference between NAT and PAT is that NAT is a process / technology in which a router or similar network device translates an IP address into another IP address, while with PAT each host on a LAN translates to the public IP. on the WAN side of the router. address, with a different port number assignment.

NAT vs. PAT Difference between NAT and PAT

NAT slows down the process of depleting the IP address space and preserving registered public addresses. PAT preserves IP addresses by assigning a single public IP to a group of hosts with the help of different port numbers. In NAT, the occurrence of address overlaps is significantly reduced. PAT reduces vulnerabilities and security attacks. NAT increases the flexibility of connection establishment. In PAT, the private address prevents the public address from being exposed. NAT eliminates the process of renumbering addresses when changing the network. PAT is also called portability, port overload, port-level multiplexed NATss, and one-way NAT. NAT has a one-to-one or many-to-one relationship. PAT has a many-to-one relationship. In NAT, public IP addresses are mapped to private IP addresses. In PAT, Multiple private IP addresses are assigned to a single public IP through the use of ports. NAT is the superset of PAT. PAT is a dynamic form of NAT. Examples of NAT are static NAT and dynamic NAT. Examples of PAT are static PAT and overloaded PAT.

Comparative chart

NAT PAT
The essential
NAT translates the private local IP to the global public IP address. PAT translates the private IP addresses of an internal network to the public IP address with the help of port numbers.
Relations
NAT is the superset of PAT. PAT is a form of dynamic NATs.
Use
NAT uses the IPv4 address. PAT uses the IPv4 address along with the port number.
Relationship
NAT has a one-to-one or many-to-one relationship. PAT has a many-to-one relationship.
Types
Static NATs and dynamic NATs are types of NATs. Static PAT and overloaded PAT are types of PAT.

What is NAT? Difference between NAT and PAT

Difference between NAT and PAT

NAT stands for Network Address Translation. NATs connects two networks and maps the private (local) address to the public (global) address. The term local means that the host address belongs to an internal network and is not assigned by a network information center or service provider. The term global indicates that the address is a lawful address assigned by the network information center or service provider. The public address also represents one or more local addresses to the outside world. NAT reduces the rate of exhaustion of IP address space and preserves registered public addresses. NAT has a lack of end-to-end traceability. NAT has two types that are static NATs that are mapped to the global address and have a one-to-one relationship. The other type is dynamic NAT, which converts an unregistered IP address to a registered private IP address. NAT is the superset of PAT.

What is PATs?

Difference between NAT and PAT
PAT

PAT stands for port address translation. PAT translates the private IP addresses of an internal network to the public IP address with the help of port numbers. With PAT, each host on a LAN is translated to the public IP address on the WAN side of the router, but with a different port number assignment. PAT is a form of dynamic NATs through which address translation can be configured at the port level while the remaining IP addresses are also optimized. PAT uses the IPv4 address along with the port number. In PAT, the private address also prevents the public address from being exposed. In PAT there is a one-to-one or many-to-one relationship. With a single IP address, no more than one type of public service is running. The PAT types are static PAT and overloaded PAT.

Key differences

  1. NAT improves security because the IP addresses of the internal hosts are invisible while, in PAT, the private address prevents the public address from being exposed.
  2. NAT, along with the IPv4 addressing scheme, preserves IPv4 addresses and extends their lifespan, on the other hand, PAT uses the IPv4 address along with the port number.
  3. NAT is a superset of PAT, while PAT is the NAT type.
  4. In the translation process, NATs uses IP addresses, while PAT uses IP addresses along with port numbers.
  5. NAT has a one-to-one or many-to-one relationship, while PAT has a many-to-one relationship.
  6. NAT uses no ports, while PAT uses source ports in the translation process.
  7. In NAT, the occurrence of address overlaps is significantly reduced, while PAT reduces vulnerabilities and security attacks.
  8. In NAT there is a lack of end-to-end traceability, while in PAT the number of entries in the internal table is reduced to keep connection records.

Conclusion

NATs and PAT protocols are used to minimize the requirement for unique IP addresses globally. They both work similarly, there is only a little difference between them. NATs does not use ports while in PAT, all internal machines can share a single translation address.

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