Free DISA STIG and SRG Library

V-62185

The layer 2 switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs.

Finding ID

SRG-NET-000362-L2S-000027

Rule ID

SV-76675r1_rule

Severity

~~Cat II~~

CCE

(None)

Group Title

SRG-NET-000362

CCI

CCI-002385

Target Key

(None)

Documentable

Discussion

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.

Fix Text

Configure the switch to have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs.

Check Content

Review the switch configuration to verify that Dynamic Address Resolution Protocol (ARP) Inspection (DAI) feature is enabled on all user VLANs. If DAI is not enabled on all user VLANs, this is a finding.