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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).
Global Settings

Global Settings

Context

Generally, NAT translates only the address in the IP packet header and the port number in the TCP/UDP header. Packets of some protocols such as DNS and FTP contain the IP address or port number in the data fields. Such contents cannot be translated through NAT. Therefore, communication between the internal network and external networks will fail.

To solve this problem, NAT must be able to identify the IP address or port information in the data field. The application level gateway (ALG) function enables the NAT device to identify the IP address or port number in the data field, and translate addresses according to the mapping table. The device provides the ALG function, so the device can support various special application protocols, including DNS, FTP, SIP, PPTP and RTSP.

Procedure

  • Configuring the ALG
    1. Log in to the web platform, and choose IP Service > NAT. Figure 13-4 shows the Global Settings area.

      Figure 13-4  Global Settings area

    2. In the Global Settings area, select application protocols supported by ALG.
    3. Click Apply. In the dialog box indicating that the operation succeeds that is displayed, click OK. The ALG configuration is complete.
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Updated: 2019-04-12

Document ID: EDOC1100041803

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