Firewall Deployment for DHCP Visibility

Deploy your firewall so it can log network traffic data for DHCP flows and forward the logs to Cortex Data Lake.
The Palo Alto Networks IoT Security app uses machine learning to classify IoT devices based on the network traffic for which these devices are either a source or destination. To accomplish this, it relies on Enhanced Application logs (EALs) generated by the Palo Alto Networks next-generation firewall.
DHCP traffic is of particular importance to the IoT security solution. DHCP provides a way to create an IP address-to-device mapping (that is, an IP address-to-MAC address mapping) that is required for classification to take place. However, a firewall typically only generates an EAL entry when it receives a unicast DHCP message; for example, when there is centralized Internet Protocol address management (IPAM) and either the firewall or another local device acts as a DHCP relay agent. Below is an example architecture that illustrates a common case where the firewall generates EALs for unicast DHCP traffic.
The firewall generates an EAL entry for broadcast DHCP traffic when the packet is seen on a virtual wire (vWire) interface with multicast firewalling enabled, as shown below.

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