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Web-based Configuration Guide

AR650, AR1600, and AR6100 V300R003

This document describes how to configure and maintain your routers using the web platform.
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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).
Internal Server

Internal Server

Context

NAT can hide internal hosts. An enterprise network can use NAT to communicate with external networks, but external users cannot access internal servers. After the mappings between "public IP address+port number" and "private IP address+port number" are defined on a virtual server, external users can access internal servers.

As shown in Figure 13-7, a company is connected to the WAN through the device enabled with the network address translation (NAT) function. The company provides the web server for users on the public network to access. The private IP address of the web server is 192.168.1.2 and its public address is the interface address of GE1/0/0, 1.1.1.1.

Figure 13-7  Networking diagram for configuring the NAT server

The following table describes the mapping between public IP address+port number (port protocol name) and private IP address+port number (port protocol name). The mapping needs to be established in Figure 13-7.

Public IP Address+Port Number (Port Protocol Name)

Private IP Address+Port Number (Port Protocol Name)

1.1.1.1+80(WWW)

192.168.1.2+80(WWW)

Procedure

  • Creating an internal server
    1. Log in to the web platform and choose IP Service > NAT > Internal Server, as shown in Figure 13-8.

      Figure 13-8  Internal Server page

    2. Click Create in the Internal Server area and set parameters in the Create Internal Server dialog box that is displayed. Table 13-8 describes the parameters.

    3. Click OK. An internal server is added to the internal server list.

      Table 13-8  Internal server parameters

      Parameter

      Description

      Interface name

      Name of an interface where NAT is to be enabled. Generally, Layer 3 interface is configured, except loopback and NULL interfaces.

      Translation type

      Whether to translate addresses according to the protocol type:
      • Protocol translation: translates addresses only when IP packets are transmitted on the specified protocol.
      • Address translation: translates IP addresses when IP packets are transmitted on any protocol.

      Protocol type

      Protocol type over the internal server. Currently, the following protocols are supported: TCP, UDP, and ICMP.

      NOTE:
      When this parameter is set to ICMP, you need to set only External IP and Internal IP.

      External IP

      Public IP address used by users to access external servers. The options are as follows:
      • Interface IP address: The IP address of the selected interface is used as the translated public IP address.
      • User-defined: A public IP address is manually specified. The specified IP address cannot be in use. The public IP address must be on the same network segment as the IP address of the NAT-enabled interface.
      • Specified interface: A specified interface address is used as the public IP address.
      NOTE:
      If users access a network through dialup such as PPPoE, you can select Interface IP address.

      External port

      Port number used by external users to access internal servers. You can select a value from the drop-down list box or enter a port number.

      • Single mapping: indicates that a public IP address (with a specified port number) is mapped to one private IP address (with a specified port number).

      • Multi-mapping: indicates that a public IP address (with a group of port numbers) is mapped to multiple private IP addresses (with a specified port number).

      Internal IP

      IP address of an internal server.

      Internal port

      Port number of an internal server. You can select a value from the drop-down list box or enter a port number.

  • Modifying an internal server
    1. Log in to the web platform and choose IP Service > NAT > Internal Server.
    2. Select an internal server in the Internal Server area, and click .
    3. In the Modify Internal Server dialog box that is displayed, modify parameters listed in Table 13-8. The parameter Interface name cannot be modified.
    4. Click OK.
  • Deleting an internal server
    1. Log in to the web platform and choose IP Service > NAT > Internal Server.
    2. Select an internal server and click Delete.
    3. In the dialog box that is displayed, click OK.
  • Updating the internal server configuration
    1. Log in to the web platform and choose IP Service > NAT > Internal Server to check the configured internal server entry.
    2. Click Refresh to update the internal server entry.
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Updated: 2019-04-12

Document ID: EDOC1100041803

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