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CLI-based Configuration Guide - Security

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 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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In Which Methods Can ACLs Be Delivered?

In Which Methods Can ACLs Be Delivered?

After an ACL is configured, it must be applied to a service module so that the ACL rules can be delivered and take effect.

Usually, an ACL is applied to a traffic policy or simplified traffic policy so that the device can deliver ACL rules globally, or on an interface to filter packets to be forwarded. In addition, an ACL can be applied to the service modules such as Telnet, FTP, and routing.

Table 5-21 describes the common ACL delivery methods.

Table 5-21  ACL delivery methods
Service Category Usage Scenario How ACLs Are Used

Filtering packets to be forwarded

The device filters received packets globally, or on an interface, and then discards, modifies priorities of, or redirects the filtered packets.

For example, you can use ACL to reduce the service level for the bandwidth-consuming services, such as P2P downloading and online video. When network congestion occurs, these packets are discarded first.

  • Simplified traffic policy: See ACL-based Simplified Traffic Policy Configuration in Huawei AR Series Access Routers Configuration Guide - QoS.

  • Traffic policy: See MQC Configuration in Huawei AR Series Access Routers Configuration Guide - QoS.

  • Packet filtering firewall: See Configuring the Packet Filtering Firewall in Huawei AR Series Access Routers Configuration Guide - Firewall.
  • Dynamic NAT: See Configuring Dynamic NAT in the Huawei AR Series Access Routers Configuration Guide - IP Services.
  • NAT server: See Configuring an Internal NAT Server in the Huawei AR Series Access Routers Configuration Guide - IP Services.

Filtering packets to be sent to the CPU

If too many protocol packets are sent to the CPU, the CPU usage increases and CPU performance degrades. The device restricts the packets to be sent to the CPU.

For example, when a user sends a large number of ARP attack packets to the device, the CPU is busy and service is interrupted. You can apply an ACL to the local attack defense service, and add the user to the blacklist so that the CPU discards the packets from this user.

Blacklist: See Configuring a Blacklist in Local Attack Defense Configuration.

Login control

The device controls access permission of users. Only authorized users can log in to the device, and other users cannot log in without permission. This ensures network security.

  • Telnet: See Enabling the Telnet Server Function in Huawei AR Series Access Routers Configuration Guide - Basic Configuration.

  • FTP: See Managing Files When the Device Functions as an FTP Server in Huawei AR Series Access Routers Configuration Guide - Basic Configuration.

  • SFTP: See Managing Files When the Device Functions as an SFTP Server in Huawei AR Series Access Routers Configuration Guide - Basic Configuration.

  • TFTP: See Managing Files When the Device Functions as a TFTP Client in Huawei AR Series Access Routers Configuration Guide - Basic Configuration.
  • Web login: See (Optional) Configuring Web System Parameters in Huawei AR Series Access Routers Configuration Guide - Basic Configuration.

  • SNMP: See (Optional) Restricting Management Rights of the NMS (SNMPv1 and SNMPv2c) and (Optional) Restricting Management Rights of the NMS (SNMPv3) in Huawei AR Series Access Routers Configuration Guide - Network Management and Monitoring.

Route filtering

ACLs can be applied to various dynamic routing protocols to filter advertised and received routes and multicast groups.

For example, you can apply an ACL to a routing policy to prevent the device from sending routes of a network segment to the neighboring router.

  • BGP: See Controlling the Advertisement of BGP Routes and Controlling the Receiving of BGP Routes in Huawei AR Series Access Routers Configuration Guide - IP Unicast Routing.

  • IS-IS (IPv4): See Configuring IS-IS to Advertise Specified External Routes to an IS-IS Routing Domain and Adding Specified IS-IS Routes to the IP Routing Table in Huawei AR Series Access Routers Configuration Guide - IP Unicast Routing.

  • OSPF: See Configuring OSPF to Filter the Received Routes, Configuring OSPF to Filter the Routes to Be Advertised, and (Optional) Configuring GR Session Parameters on the Helper in Huawei AR Series Access Routers Configuration Guide - IP Unicast routing.

  • RIP: See Configuring RIP to Import Routes and Configuring RIP to Filter Received Routes in Huawei AR Series Access Routers Configuration Guide - IP Unicast routing.

  • Multicast: See Filtering IGMP Messages Based on Source IP Addresses, Configuring a Multicast Group Policy, (Optional) Configuring the Range of Multicast Groups That an Interface Can Join, and (Optional) Configuring an SSM Group Policy in Huawei AR Series Access Routers Configuration Guide - IP Multicast.

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Updated: 2019-08-07

Document ID: EDOC1100034077

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