Default ACL Actions and Mechanisms of Different Service Modules

CloudEngine 12800 and 12800E V200R005C10 Configuration Guide - Security

This document describes the configurations of Security, including AAA, 802.1x Authentication, ACL, TCAM ACL Customization, local attack defense, Microsegmentation, MFF, attack defense, traffic suppression and storm control, ARP security, Port security, MACsec, DHCP snooping, IPSG, URPF, SSL, Keychain and FIPS.

About This Document
AAA Configuration
- Overview of AAA
- Understanding AAA
- Application Scenarios for AAA
- Licensing Requirements and Limitations for AAA
- Summary of AAA Configuration Tasks
- Configuring Local Authentication and Authorization
- Configuring RADIUS AAA
- Configuring HWTACACS AAA
- Clearing AAA Statistics
- Configuration Examples for AAA
  - Example for Configuring RADIUS Authentication and Accounting
  - Example for Configuring HWTACACS Authentication, Accounting, and Authorization
- Troubleshooting AAA
  - An AAA Local User Cannot Be Created Due to Incorrect Password Setting
802.1x Authentication Configuration
- Understanding 802.1x Authentication
- Application Scenarios for 802.1x Authentication
- Licensing Requirements and Limitations for 802.1x Authentication
- Default Settings for 802.1x Authentication
- Configuring 802.1x Authentication
- Maintaining 802.1x Authentication
  - Clearing Statistics on 802.1x Authentication Packets
  - Forcing Users Offline
- Configuration Examples for 802.1x Authentication
  - Example for Configuring 802.1x Authentication to Control Users' Internal Access
ACL Configuration
- Overview of ACLs
- Understanding ACLs
- Application Scenarios for ACLs
- Licensing Requirements and Limitations for ACLs
- Default Settings for ACLs
- Configuring a Basic ACL
- Configuring an Advanced ACL
- Configuring a Layer 2 ACL
- Configuring a User-defined ACL
- Configuring an ARP-based ACL
- Configuring a Basic ACL6
- Configuring an Advanced ACL6
- Maintaining an ACL
  - Clearing ACL Statistics
  - Checking ACL Resource Usages
- Configuration Examples for ACLs
- ACL FAQ
  - Which Packets Cannot Be Filtered by the ACL Used by a Traffic Policy?
TCAM ACL Customization Configuration
- Overview of TCAM ACL Customization
- Licensing Requirements and Limitations for TCAM ACL Customization
- Configuring TCAM ACL Customization
  - Enabling TCAM ACL Customization
  - Configuring the TCAM ACL Customization Function for Services
- Displaying Information about a TCAM ACL Customization Profile or Preset Profile
- Configuration Examples for TCAM ACL Customization
  - Example for Configuring TCAM ACL Customization
Microsegmentation Configuration
- Overview of Microsegmentation
- Understanding Microsegmentation
- Application Scenarios for Microsegmentation
- Licensing Requirements and Limitations for Microsegmentation
- Configuring Microsegmentation
- Maintaining Microsegmentation
  - Checking Microsegmentation Statistics
  - Clearing Microsegmentation Statistics
- Configuration Examples for Microsegmentation
  - Example for Configuring IP Address-based Microsegmentation
Local Attack Defense Configuration
- Overview of Local Attack Defense
- Licensing Requirements and Limitations for Local Attack Defense
- Default Settings for Local Attack Defense
- Configuring CPU Attack Defense
- Configuring Attack Source Tracing
- Maintaining Local Attack Defense
- Configuration Examples for Local Attack Defense
  - Example for Configuring Local Attack Defense
- Troubleshooting Local Attack Defense
MFF Configuration
- Overview of MFF
- Understanding MFF
- Application Scenarios for MFF
- Licensing Requirements and Limitations for MFF
- Configuring MFF
- Configuration Examples for MFF
  - Example for Configuring MFF to Implement Layer 2 Isolation and Layer 3 Connection
- Troubleshooting MFF
  - Users Fail to Access the Internet After MFF Is Configured
Attack Defense Configuration
- Overview of Attack Defense
- Understanding Attack Defense
- Application Scenarios for Attack Defense
- Licensing Requirements and Limitations for Attack Defense
- Default Settings for Attack Defense
- Configuring Defense Against Malformed Packet Attacks
- Configuring Defense Against Packet Fragment Attacks
- Configuring Defense Against Flood Attacks
- Clearing Attack Defense Statistics
- Configuration Examples for Attack Defense
  - Example for Configuring Attack Defense
Traffic Suppression and Storm Control Configuration
- Overview of Traffic Suppression and Storm Control
- Understanding Traffic Suppression and Storm Control
  - Traffic Suppression
  - Storm Control
- Application Scenarios for Traffic Suppression and Storm Control
  - Traffic Suppression
  - Storm Control
- Licensing Requirements and Limitations for Traffic Suppression and Storm Control
- Default Settings for Traffic Suppression and Storm Control
- Configuring Traffic Suppression
- Configuring Storm Control
- Configuration Examples for Traffic Suppression and Storm Control
  - Example for Configuring Traffic Suppression
  - Example for Configuring Storm Control
ARP Security Configuration
- Overview of ARP Security
- Understanding ARP Security
- Application Scenarios for ARP Security
  - Defense Against ARP Flood Attacks
  - Defense Against ARP Spoofing Attacks
- Licensing Requirements and Limitations for ARP Security
- Default Settings for ARP Security
- Configuring Defense Against ARP Flood Attacks
- Configuring Defense Against ARP Spoofing Attacks
- Maintaining ARP Security
- Configuration Examples for ARP Security
  - Example for Configuring ARP Security Functions
  - Example for Configuring Defense Against ARP MITM Attacks
Port Security Configuration
- Overview of Port Security
- Understanding Port Security
- Application Scenarios for Port Security
- Licensing Requirements and Limitations for Port Security
- Default Settings for Port Security
- Configuring Port Security
- Configuration Examples for Port Security
  - Example for Configuring Port Security
MACsec Configuration
- Overview of MACsec
- Understanding MACsec
- Application Scenarios for MACsec
- Default Configuration
- Licensing Requirements and Limitations for MACsec
- Configuring MACsec
- Maintaining MACsec
  - Displaying MACsec Statistics
  - Clearing MACsec Statistics
- Configuration Examples for MACsec
  - Example for Configuring Point-to-Point MACsec
DHCP Snooping Configuration
- Overview of DHCP Snooping
- Understanding DHCP Snooping
  - DHCP Snooping Fundamentals
  - Option 82 Supported by DHCP Snooping
- Application Scenarios for DHCP Snooping
- Licensing Requirements and Limitations for DHCP Snooping
- Default Settings for DHCP Snooping
- Configuring Basic Functions of DHCP Snooping
- Configuring DHCP Snooping Attack Defense
- Inserting the Option 82 Field in a DHCP Message
- Maintaining DHCP Snooping
- Configuration Examples for DHCP Snooping
  - Example for Configuring DHCP Snooping Attack Defense
- Troubleshooting DHCP Snooping
  - DHCP Clients Cannot Go Online Due to DHCP Snooping
IPSG Configuration
- Overview of IPSG
- Licensing Requirements and Limitations for IPSG
- Default Settings for IPSG
- Configuring IPSG
- Maintaining IPSG
  - Checking Statistics on Discarded IP Packets
  - Clearing Statistics on Discarded IP Packets
- Configuration Examples for IPSG
  - Example for Configuring IPSG to Check Interface + IP + MAC Binding Entries
URPF Configuration
- Overview of URPF
- Understanding URPF
- Application Scenarios for URPF
- Licensing Requirements and Limitations for URPF
- Default Settings for URPF
- Configuring URPF
- Configuration Examples for URPF
  - Example for Configuring URPF (CE12800)
  - Example for Configuring URPF (CE12800E)
SSL Configuration
- Overview of SSL
- Understanding SSL
- Application Scenarios for SSL
  - Application of SSL in Information Center
- Licensing Requirements and Limitations for SSL
- Configuring SSL
  - Configuring an SSL Policy
  - Applying an SSL Policy
- Configuration Examples for SSL
  - Example for Outputting SSL-Encrypted Logs to a Log Host
Keychain Configuration
- Overview of Keychains
- Understanding Keychains
- Application Scenarios for Keychains
- Licensing Requirements and Limitations for Keychain
- Configuring a Keychain
- Configuration Examples for Keychains
  - Example for Applying the Keychain to RIP
  - Example for Applying the Keychain to BGP
FIPS Configuration
- Overview of FIPS
- Configuring the FIPS Mode
Separating the Management Port from the Service Plane
Checking Security Risks
Setting the System Master Key

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Default ACL Actions and Mechanisms of Different Service Modules

ACL Matching Mechanism

The device stops matching packets against ACL rules as long as the packets match one rule, as shown in Figure 3-1.

Figure 3-1 ACL matching mechanism

The ACL matching results include "positive match" and "negative match".

Positive match: Packets match a rule in an ACL.
Negative match: No ACL exists, the ACL does not contain rules, or packets do not match any rule in an ACL.

Whether a packet is permitted or denied is determined by the action specified in the associated ACL rule and the service module to which the ACL is applied. Different service modules process the packets that positively and negatively match ACL rules in different ways. For example, the Telnet module forwards packets as long as the packets match an ACL rule in which the permit action is configured. The traffic policy module, however, processes such packets differently: It denies such packets if the action configured in the traffic behavior is deny.

Table 3-2 describes the default ACL actions and mechanisms of different service modules.

Table 3-2 Default ACL actions and mechanisms of different service modules

ACL Action	VTY	Telnet	SSH	FTP	SNMP	MQC (Traffic Policy/Simplified Traffic Policy)	Local Attack Defense Blacklist	Local Attack Defense Filter	Attack Source Tracing Whitelist
Default action	deny	deny	deny	deny	deny	permit	permit	permit	The whitelist does not take effect.
Permit rule matched	When the ACL is applied in the inbound direction, only the devices matching the ACL rule can access the local device. When the ACL is applied in the outbound direction, the local device can access the devices matching the ACL rule.	permit (Allows login.)	permit (Allows login.)	permit (Allows login.)	permit (Allows login.)	permit (Executes the action defined in the policy.)	deny (Discards packets.)	permit (Executes the action defined in the policy.)	Adds a whitelist item, which is not affected by the permit rule.
Deny rule matched	When the ACL is applied in the inbound direction, the devices matching the ACL rule cannot access the local device. When the ACL is applied in the outbound direction, the local device cannot access the devices matching the ACL rule.	deny (Denies login.)	deny (Denies login.)	deny (Denies login.)	deny (Denies login.)	deny (Discards packets.)	deny (Discards packets.)	deny (Discards packets.)	Adds a whitelist item, which is not affected by the deny rule.
No ACL rule matched	When the ACL is applied in the inbound direction, other devices cannot access the local device. When the ACL is applied in the outbound direction, the local device cannot access other devices.	deny (Denies login.)	deny (Denies login.)	deny (Denies login.)	deny (Denies login.)	permit (The function does not take effect and packets are forwarded.)	permit (The function does not take effect and packets are sent to the CPU.)	permit (The function does not take effect and packets are sent to the CPU.)	The whitelist does not take effect.
No rule configured in the ACL	When the ACL is applied in the inbound direction, any other devices can access the local device. When the ACL is applied in the outbound direction, the local device can access any other devices.	permit (Allows login.)	permit (Allows login.)	permit (Allows login.)	permit (Allows login.)	permit (The function does not take effect and packets are forwarded.)	permit (The function does not take effect and packets are sent to the CPU.)	permit (The function does not take effect and packets are sent to the CPU.)	The whitelist does not take effect.
VPN information configured in the ACL	The VPN parameter settings take effect. If the VPN parameter settings on the inbound interface of packets are inconsistent with those in the ACL, the login is denied.	The VPN parameter settings take effect. If the VPN parameter settings on the inbound interface of packets are inconsistent with those in the ACL, the login is denied.	The VPN parameter settings take effect. If the VPN parameter settings on the inbound interface of packets are inconsistent with those in the ACL, the login is denied.	The VPN parameter settings take effect. If the VPN parameter settings on the inbound interface of packets are inconsistent with those in the ACL, the login is denied.	The VPN parameter settings take effect. If the VPN parameter settings on the inbound interface of packets are inconsistent with those in the ACL, the login is denied.	VPN parameter settings do not take effect.	VPN parameter settings do not take effect.	VPN parameter settings do not take effect.	VPN parameter settings do not take effect.

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Updated: 2021-09-17

Document ID: EDOC1100075347

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Default ACL Actions and Mechanisms of Different Service Modules

ACL Matching Mechanism