Can the device prevent ARP attacks after the ARP anti-attack function is configured


After the ARP anti-attack function is configured, the device can only reduce the impact of the ARP attacks. For example:

--ARP Miss message limiting can only reduce the impact of ARP Miss attacks, but cannot prevent ARP Miss attacks or defend against ARP packet attacks or ARP spoofing attacks.
--ARP gateway anti-collision can only prevent bogus gateway attacks, but cannot prevent ARP flood attacks or ARP spoofing gateway attacks.

Other related questions:
How to configure ARP anti-attack on an AR router
On a network, common ARP attack methods include ARP flooding and ARP spoofing. To avoid different types of harm caused by the ARP attacks, multiple types of solutions to the ARP security features are provided according to the attack types. By configuring ARP anti-flooding
and anti-spoofing, the maintenance cost arising from ensuring normal running of a network and security of network information can be effectively reduced, thereby providing users with a more secure network environment and more stable network services. For details about the configuration procedure, see the URL: AR100&AR120&AR150&AR160&AR200&AR1200& AR1600&AR2200&AR3200&AR3600 V200R007 Product Documentation.

ARP anti-spoofing configuration on S series switch
The S series switch, except S1700, provides various methods to prevent ARP spoofing attacks. Dynamic ARP inspection (DAI) This function applies to the network where DHCP snooping is configured. It is recommended to configure DAI on the access switches.DAI can prevent man-in-the-middle attacks. # Enable DAI on GE 1/0/1. [HUAWEI] interface gigabitethernet 1/0/1 [HUAWEI-GigabitEthernet1/0/1] arp anti-attack check user-bind enable # Enable DAI in VLAN 100. [HUAWEI] vlan 100 [HUAWEI-vlan100] arp anti-attack check user-bind enable - Configure fixed ARP. To prevent ARP spoofing attacks, configure fixed ARP on the gateway. # Enable fixed ARP in fixed MAC mode. [HUAWEI] arp anti-attack entry-check fixed-mac enable - Configure ARP gateway anti-collision (available on only S5720SI/S5720S-SI, S5720EI, S5720HI, S6720EI, and modular switches). When user hosts are directly connected to the gateway, configure this function on the gateway. # Enable ARP gateway anti-collision. [HUAWEI] arp anti-attack gateway-duplicate enable - Configure the switch to actively discard gratuitous ARP packets (only available on modular switches). If you confirm that the gratuitous ARP packets are from attackers, enable the gateway to actively discard gratuitous ARP packets. # Enable the switch to actively discard gratuitous ARP packets globally. [HUAWEI] arp anti-attack gratuitous-arp drop

After ARP attack defense is configured on S series switches, whether the device can defend against ARP attacks
For S series switches, the ARP attack defense function can only defend against appropriate ARP attacks after it is configured. For example: The rate limit on ARP Miss messages can only mitigate the impact of ARP Miss attacks, but cannot shield them. Also, ARP packet attacks and ARP spoofing attacks cannot be prevented. ARP gateway anti-collision can only defend against attacks from bogus gateways, but cannot shield ARP flood attacks and ARP gateway spoofing attacks.

How to prevent ARP attacks targeted at static users
Static users (for example, dumb terminals such as printers and servers) are allocated static IP addresses. Attackers usually steal authorized users' IP addresses to connect to networks and initiate ARP attacks to interrupt network communication. To defend against ARP attacks, a static user binding table and dynamic ARP inspection (DAI) can be configured for static users. DAI checks ARP packets based on binding entries. Run the user-bind static command to configure the static user binding table, and run the arp anti-attack check user-bind enable command to enable DAI. After the configuration, when a device receives an ARP packet, it compares the source IP address, source MAC address, interface number, and VLAN ID of the ARP packet with static binding entries. If the ARP packet matches a binding entry, the device considers the ARP packet valid and allows the packet to pass through. If the ARP packet does not match a binding entry, the device considers the ARP packet invalid and discards the packet.

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