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CLI-based Configuration Guide - IP Service

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.

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Summary of NAT Configuration Tasks

Summary of NAT Configuration Tasks

As shown in Table 5-2, users can select NAT features based on usage scenarios and configure the selected NAT features.

Table 5-2  NAT configuration tasks




Internal hosts use private IP addresses to access external networks.

Internal hosts of an enterprise use private IP addresses to communicate with each other, but cannot access external networks. Dynamic NAT translates the private IP address of a device to the public IP address and establishes a mapping between the private and public address. When the response packet reaches the device, the public IP address is translated to the private IP address and then forwarded to the host. In this way, intranet users can access external networks.

Configuring Dynamic NAT

Important internal hosts use fixed public IP addresses and interface numbers to communicate with external hosts.

During dynamic NAT, it cannot use fixed public IP addresses and interface numbers to replace the private IP addresses and interface numbers. When some important hosts need to access the external network, they must use fixed public IP addresses and interface numbers. Dynamic NAT cannot meet this requirement.

Static NAT sets up a fixed mapping between public and private IP addresses. A specific private IP address can be replaced only by the specified public IP address. In this way, the important hosts can access the external network using fixed public IP addresses.

Configuring Static NAT

External users access internal servers.

NAT can shield IP addresses off internal hosts. When the internal network needs to provide services such as web and FTP services for external users, internal servers must be accessible to external users at any time.

The NAT server enables the internal servers to be accessible at any time. By configuring the mapping between the public and private IP addresses and between the public and private interface numbers, the NAT device can translate public IP addresses to private IP addresses.

Configuring an Internal NAT Server
Updated: 2019-05-20

Document ID: EDOC1100034231

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