Configuring ARP packet validity check
Perform this task to enable validity check for ARP packets received on untrusted ports and specify the following objects to be checked.
src-mac—Checks whether the sender MAC address in the message body is identical to the source MAC address in the Ethernet header. If they are identical, the packet is forwarded. Otherwise, the packet is discarded.
dst-mac—Checks the target MAC address of ARP replies. If the target MAC address is all-zero, all-one, or inconsistent with the destination MAC address in the Ethernet header, the packet is considered invalid and discarded.
ip—Checks the sender and target IP addresses of ARP replies, and the sender IP address of ARP requests. All-zero, all-one, or multicast IP addresses are considered invalid and the corresponding packets are discarded.
To configure ARP packet validity check:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter VLAN view. | vlan vlan-id | N/A |
3. Enable ARP detection. | arp detection enable | Disabled by default. |
4. Return to system view. | quit | N/A |
5. Enable ARP packet validity check and specify the objects to be checked. | arp detection validate { dst-mac | ip | src-mac } * | Disabled by default. |
6. Enter Layer 2 Ethernet interface view or Layer 2 aggregate interface view. | interface interface-type interface-number | N/A |
7. Configure the port as a trusted port that is excluded from ARP detection. | arp detection trust | Optional. The port is an untrusted port by default. |