bandwidth shrunken with speedtest

[Scanline]

I'm using 800d and just upgrade my internet to 5Gbps

but It looks like that 800d reducing bandwidth to lesser than 1G and even worse 300~400Mbps

when I check out side of 800d, my internet recorded 1600~1800Mbps while it reduced to just 350Mbps with my 800d

800d is connected with 10G SFP+ with ISP's modem and it also connected to 10G HP core and distributed to multiple client machine as 1G

as you know, the client machines are connected with 1Gbps, but that doesn't matter since we can expect at least 800~900Mbps without 800d

also when I test it with multiple client machine but the maximum bandwidth of them couldn't event exceed 3~400Mbps

Is there any way to fix it?

[AEK]

Which FortiOS version?

Can you do a test with a flow-based non-UTM policy (disable all security profiles)?

[Scanline]

Hey AEK

the OS version is "Version: FortiGate-800D v7.0.14,build0601,240206 (GA.M)"

[hbac]

Hi @Scanline,

Additionally, you can check physical interfaces by running the following commands. Make sure that speed negotiation is correct. 

di hardware deviceinfo nic <port> 

fnsysctl ifconfig 

Regards, 

[Scanline]

hi hbac, 

the pyysical interface seems to be fine. the link status shows as 10000

======== Link Settings ==========
link_autonego :0
link_setting :1
link_speed :10000
link_duplex :1
link_fec :None (0x0)
link_fec_cap :None (0x0)
link_serdes_if :None
serdes_if_cap : (0x0)
serdes_dflt :0
pm_mode_setting :0
pm_mode :0x0
pm_mode_dflt :0
pm_port :No
medium_mode :0
========== Link Status ==========
Admin :up
netdev status :up
Speed :10000
Duplex :Full
link_status :Up
rx_link_status :1
int_phy_link :0
local_fault :0
local_warning :0
remote_fault :0
nr_reset :0