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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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Application Scenarios for NAT

Application Scenarios for NAT

Private Network Hosts Accessing Public Network

Private IP addresses are planned for hosts on private networks for communities, schools, and enterprises because public IP addresses are limited. In this case, the NAT technology can be used to implement access from hosts on the private networks to public networks. As shown in Figure 7-93, Easy IP is configured on the AP to enable the hosts on the private network to access the server on the public network.

Figure 7-93  Networking diagram for private network hosts accessing public network servers

Public Network Hosts Accessing Private Network Servers

On private networks, some servers such as web servers and FTP servers need to provide services for public network users. NAT supports this application. As shown in Figure 7-94, the NAT server is configured. That is, mapping between the public IP address and port number and the private IP address and port number is defined. As a result, the host on the public network can access the server on the private network using the mapping.

Figure 7-94  Networking diagram for public network hosts accessing private network servers

Private Network Hosts Accessing Private Network Servers Using the Domain Name

Hosts on a private network need to access a server on the same private network using the domain name. The DNS server, however, is located on a public network. You can configure DNS mapping to allow the private network hosts to access the DNS server. As shown in Figure 7-95, a DNS mapping table is configured to define mapping between the domain name, public IP address, public port number, and protocol type. The public IP address carried in the DNS response packet is replaced by the private IP address of the server on the private network. In this manner, hosts on the private network can access the server using the domain name.

Figure 7-95  Networking diagram for private network hosts accessing private network servers using the domain name

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Updated: 2019-01-11

Document ID: EDOC1000176006

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