Detections
Analytics

1.10 CISC-L2-000150

Information

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

GROUP ID: V-220661
RULE ID: SV-220661r929003

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.

Solution

Configure the switch to have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs as shown in the example below:

SW2(config)#ip arp inspection vlan 2,4-8,11

See Also

https://workbench.cisecurity.org/benchmarks/23612

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, CAT|II, CCI|CCI-002385, Rule-ID|SV-220661r929003_rule, STIG-ID|CISC-L2-000150, Vuln-ID|V-220661

Plugin: Cisco

Control ID: 71fff82d4b0de37b70354cd1b543f43dadb2e609a158689e643bd98fda776b4b