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epinheiro
Staff
epinheiro
Staff
April 1, 2026

Technical Tip: 'View DHCP Clients' from FortiSwitch VLANs does not filter DHCP leases correctly in FortiOS v7.6.6

  • April 1, 2026
  • 0 replies
  • 366 views
Description This article describes an issue in FortiOS v7.6.6 where the View DHCP Clients option does not correctly filter DHCP leases when accessed from the FortiSwitch VLANs page.
Scope FortiGate, FortiSwitch, FortiLink.
Solution

In FortiOS v7.4.11, FortiGate correctly applies the VLAN filter and displays only the DHCP clients for the selected VLAN.

 

WiFi & Switch Controller -> FortiSwitch VLANs -> VLAN -> View DHCP Clients.

 

v7.4.11 - Image1.png

 

v7.4.11 - Image2.png

 

In FortiOS v7.6.6, instead of showing only the DHCP clients for the selected VLAN, the window may display leases from other VLANs and from the FortiLink interface.

 

v7.6.6 - Image2.png

 v7.6.6 - Image1.png

 

Workarounds:

  1. Manually filter the VLAN interface:

 

v7.6.6 workaround.png

 

  1. Use a secondary path: Network -> Interfaces -> VLAN -> Show -> View DHCP Clients.

 

7.6.6 Secondary Path.png

 

 

list all the DHCP address leases in the CLI, execute the following command:

 

execute dhcp lease-list

 

 

To list the DHCP lease to a particular VLAN interface only.

 

execute dhcp lease-list < VLAN interface>

 

Note: This issue is only a display problem on the management screen. The issue does not affect network performance or security. Even though the list shows devices from other VLANs, those devices remain properly separated within their respective VLANs. The FortiGate continues assigning correct IP addresses, and firewall rules operate as expected. This issue is currently under investigation by the R&D team, and updates will be provided once a fix becomes available.

 
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