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Assessment Title
Rule Text
The Juniper EX switch must be configured to enable Dynamic Address Resolution Protocol (ARP) Inspection (DAI) on all user VLANs.
Description
Discussion Text
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.
This requirement is applicable to VLANs with active access interfaces assigned but not to switches that only trunk the VLANs between switches.
This requirement is applicable to VLANs with active access interfaces assigned but not to switches that only trunk the VLANs between switches.
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