Title

The RUCKUS ICX switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs. (Cat II impact)

Discussion

DAI intercepts 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.

Check Content

Review list of VLANs with ARP inspection configured. ICX#show ip arp inspection IP ARP inspection enabled on 1 VLAN(s): VLAN(s): 16 If ARP Inspection is not enabled on all user VLANs, this is a finding.

Fix Text

Configure the switch to have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs. 1. Enter global configuration mode: device# configure terminal device(config)# ip arp inspection vlan 2 Optional Step 2: Apply to multiple VLANs: device# configure terminal device(config)# ip arp inspection vlan 100 to 150 160 170 to 200

Additional Identifiers

Rule ID: SV-273683r1110986_rule

Vulnerability ID: V-273683

Group Title: SRG-NET-000362-L2S-000027

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.