Technical Tip: How to revoke DHCP leases on a FortiGate unit.

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Description

This article describes how to clear/revoke DHCP leases when FortiGate acts as a DHCP server. 

Scope

FortiGate.

Solution

To revoke DHCP leases on the GUI: 

1. Go to Dashboard -> Network -> DHCP.

2. Select IP addresses that need to be revoked and select 'Revoke'.

To revoke DHCP leases in the CLI: 

1. To revoke all leases, execute the following command:

execute dhcp lease-clear all

2. To revoke a specific IP address:
   
   

execute dhcp lease-clear x.x.x.x 

3. To revoke an IP range:

execute dhcp lease-clear x.x.x.x-x.x.x.x

Related article: 

Technical Tip: DHCP address leases on a FortiGate