The HP FlexFabric Switch must have Dynamic ARP Inspection (DAI) enabled on all user VLANs.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-66075	SRG-NET-000362-L2S-000027	HFFS-L2-000016	SV-80565r1_rule	2020-06-03	1

Description
DAI intercepts Address Resolution Protocol (ARP) requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the local ARP cache and before forwarding the packet to the appropriate destination. Invalid ARP packets are dropped and logged. DAI determines the validity of an ARP packet based on valid IP-to-MAC address bindings stored in the DHCP snooping binding database. If the ARP packet is received on a trusted interface, the switch forwards the packet without any checks. On untrusted interfaces, the switch forwards the packet only if it is valid.

Description

DAI intercepts Address Resolution Protocol (ARP) requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the local ARP cache and before forwarding the packet to the appropriate destination. Invalid ARP packets are dropped and logged. DAI determines the validity of an ARP packet based on valid IP-to-MAC address bindings stored in the DHCP snooping binding database. If the ARP packet is received on a trusted interface, the switch forwards the packet without any checks. On untrusted interfaces, the switch forwards the packet only if it is valid.

ℹ️ Check
Review the HP FlexFabric Switch configuration to verify that Dynamic ARP Inspection (DAI) feature is enabled on all user VLANs. If DAI is not enabled on all user VLANs, this is a finding. [HP]display arp detection ARP detection is enabled in the following VLANs: 2 [HP]display arp detection statistics interface Ten-GigabitEthernet 1/0/11 State: U-Untrusted T-Trusted ARP packets dropped by ARP inspect checking: Interface(State) IP Src-MAC Dst-MAC Inspect XGE1/0/11(T) 0 0 0 0 [HP]

ℹ️ Check

Review the HP FlexFabric Switch configuration to verify that Dynamic ARP Inspection (DAI) feature is enabled on all user VLANs. If DAI is not enabled on all user VLANs, this is a finding. [HP]display arp detection ARP detection is enabled in the following VLANs: 2 [HP]display arp detection statistics interface Ten-GigabitEthernet 1/0/11 State: U-Untrusted T-Trusted ARP packets dropped by ARP inspect checking: Interface(State) IP Src-MAC Dst-MAC Inspect XGE1/0/11(T) 0 0 0 0 [HP]

✔️ Fix
Configure the HP FlexFabric Switch to have Dynamic ARP Inspection (DAI) enabled on all user VLANs. [HP-vlan2]arp detection enable [HP-Ten-GigabitEthernet1/0/11]arp detection trust