Download bandwidth issue through WAN interface

[Zorro444]

Hi,

I use OPNsense 21.7.4 and I have a download bandwidth quite bad regarding to what I should get.
I am around 400Mbps when testing the connection  but if I link my computer directly on the FAI's box I am around 1 Gbps.

My setup is the following:  physical Interfaces > WAN FAI1, WAN FAI2, LAN, WIFI
On the WAN inteface. I use the FAI boxes, respectively LiveBox and Freebox, each ones are in DMZ mode sending the data to their respective interface adresses on the OPNSense

On the LAN interface I have a Cisco switch.

I performed some bandwitdh tests on LAN interface, bandwitdh is around 1 Gbps.


I have checked the CPU usage of the hardware hosting Opnsense, we are around 30% so no issue there.
I have no pipe rules or any other limitation setup.
The issue is there for both WAN and seems to affect only or at least in a clear way the download bandwidth, the upload seems correct.

I have read some people with similar issue speaking about some VLan configuration, but I am not sure to have really understood what to do.

Does anyone have a clue for me?

Thanks.