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CLI-based Configuration Guide - Security

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

This document provides the basic concepts, configuration procedures, and configuration examples in different application scenarios of the network management feature supported by the device.
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Configuring Port Mapping

Configuring Port Mapping

Context

Application-layer protocols use well-known ports for communication. Port mapping enables you to define new port numbers for application-layer protocols, such as FTP, DNS, HTTP, SIP, PPTP and RTSP, which protect servers against service-specific attacks. Port mapping applies to service-sensitive features such as application specific packet filter (ASPF) and Network Address Translation (NAT).

Port mapping is implemented based on basic ACLs (2000 to 2999). The firewall matches destination IP addresses of packets with the IP addresses configured in basic ACL rules and performs port mapping only for the packets matching the ACL rules.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run port-mapping { dns | ftp | http | sip | rtsp | pptp } port port-number acl acl-number

    Port mapping is configured.

    You can map multiple ports to a protocol, or map a port to multiple protocols. The mappings, however, must be distinguished by ACLs. That is, packets matching different ACL rules use different mapping entries.

    NOTE:

    Port mapping identifies the protocol type of the packets destined for an IP address (such as the IP address of a WWW server). Therefore, when configuring the basic ACL rules, match the destination IP addresses of the packets with the source IP addresses defined in ACL rules.

Verifying the Configuration

  • Run the display port-mapping [ dns | ftp | http | rtsp | sip | port port-number | pptp ] command to check information about port mapping.
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Updated: 2019-05-20

Document ID: EDOC1100034236

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