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Troubleshooting Tip: DORA packet review in the newer Kea DHCP format

Description

This article describes ways to assist troubleshooting of DHCP in the newer Kea DHCP format in nacOS 7.6.3+.

Scope

FortiNAC-F 7.6.3+.

Solution

A complete DHCP cycle looks like the following:

DHCPDISCOVER is sent from Host to NAC

DHCPOFFER is sent from NAC to Host

DHCPREQUEST is sent from Host to NAC

DHCPACK from NAC to Host

Make sure the service is active and running:

execute service status kea-dhcp4

Run the following in the nacOS CLI to see the DORA process:

execute tcpdump -i port2 -v 'port 67 or port 68'

Use a packet capture application to filter against specific MACs to simplify troubleshooting:

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