Clients are receiving DHCP leases from Fo...

FortiGate

FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.

Article Id 378620

Description

This article describes the issue where clients are receiving DHCP leases from FortiGate despite the relay agent being configured.

Scope

FortiOS.

Solution

The FortiGate was initially configured to provide DHCP leases to internal clients. However, it was later reconfigured to relay requests to an external DHCP server.

Before:

After:

This configuration will not disable the DHCP server on the FortiGate and must delete the DHCP configuration in the CLI.

FGT # config system DHCP server

FGT (server) # sh

config system dhcp server

edit 6

set dns-service local

set default-gateway 192.168.11.1

set netmask 255.255.255.0

set interface "VM"

config ip-range

edit 1

set start-ip 192.168.11.2

set end-ip 192.168.11.254

end

To delete the DHCP lease use the following command:

FGT (server)
delete 6
end

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Technical Tip: Clients are receiving DHCP leases from FortiGate despite the relay agent being configured

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