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acorniola
acorniola
New Member
April 9, 2025
Question

DHCP Relay Issue on VLANs with FortiLink over IPSec (FortiGate 91G / FortiSwitch)

  • April 9, 2025
  • 2 replies
  • 643 views

Hello everyone,Immagine 2025-04-09 161453.jpg

 

Immagine 2025-04-09 161644.jpg

 

 

have a FortiGate 91G managing a FortiSwitch via FortiLink over IPSec. While the FortiLink connection is successfully established, when I configure the DHCP relay on the VLANs, client devices are not receiving IP addresses.

Has anyone encountered this problem or found a solution? Any guidance would be greatly appreciated!

Thank you in advance.

2 replies

AEK
SuperUser
AEK
SuperUser
April 9, 2025

Hi Acorniola

With "diag sniffer packet any ...", check if the DHCP queries are properly forwarded to destination 192.168.88.1. Also check with the same command if the DHCP replies are blocked somewhere.

AEK
AEK
SuperUser
AEK
SuperUser
April 9, 2025

Here in your config I see DHCP server 192.168.88.1 is in the same subnet as the interface address, and if I'm not wrong it is in the same broadcast domain as the clients, right?

In that case why you configure DHCP relay? If they are on the same broadcast domain as the DHCP server then their DHCP request should reach the DHCP server without need to configure relay.

AEK
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