How to configure ARP attack defense on S series switches


For S series switches (except S1700 switches), you can configure ARP security to prevent ARP attacks. A switch may receive a large number of ARP packets when acting as a gateway. In this case, configure ARP security on the switch to protect the gateway. For example, configure the rate limit on ARP packets and ARP Miss messages to prevent ARP flood attacks. E series switches do not support the rate limit on ARP Miss messages.
Common ARP attacks include:
ARP flood attack is also called Denial of Service (DoS) attack.
ARP spoofing attack: An attacker sends bogus ARP packets to network devices. The devices then modify ARP entries, causing communication failures.
ARP security protects network devices against ARP attacks by learning ARP entries, limiting the ARP packet rate, and checking ARP packets. In addition to preventing ARP protocol attacks, ARP security also prevents ARP-based network scanning 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.

How do S series switches perform ARP attack defense for static users
For S series switches: Static users are users configured with static IP addresses, for example, static IP addresses are assigned to dumb terminals such as printers and servers. Attackers usually use the IP address of an authenticated user to connect to the network and initiate ARP attacks, damaging network communications. To defend against ARP attacks, static users can be configured with a static binding table and the DAI function to enable the switch check the ARP packets against the binding table. The static user binding table can be configured using the user-bind static command. The DAI function can be enabled using the arp anti-attack check user-bind enable command. When a switch receives an ARP packet, it compares the source IP address, source MAC address, VLAN ID, and interface number of the ARP packet with static binding entries. If the ARP packet matches a binding entry, the device considers the ARP packet valid and relays the packet. If the ARP packet does not match any binding entry, the device considers the ARP packet invalid and discards the packet.

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.

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