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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Overview of NAT

Overview of NAT

Definition

Network Address Translation (NAT) translates the IP address in an IP datagram header to another IP address.

Purpose

The rapid development of the Internet brings an increasing number of network applications. Exhaustion of IPv4 addresses has become a bottleneck for the network development. IPv6 can solve the problem of IPv4 address shortage, but numerous network devices and applications are based on IPv4. Major transitional technologies such as classless inter-domain routing (CIDR) and private network addresses are used before the wide use of IPv6 addresses. NAT enables users on private networks to access public networks. When a host on a private network accesses a public network, NAT translates the host's private IP address to a public IP address. Multiple hosts on a private network can share one public IP address. This implements network communication while saving public IP addresses. For the classification of private IP addresses, see IPv4 Address.

Benefits

As a transitional plan, NAT enables address reuse to meet the demand for IP addresses, therefore alleviating the IPv4 address shortage. In addition to solving the problem of IP address shortage, NAT provides the following advantages:
  • Protects private networks against external attacks, greatly improving network security.
  • This function controls not only access to external networks from internal hosts, but also access to the internal network from external users.
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Updated: 2019-01-11

Document ID: EDOC1000176006

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