[root@vcf01-prg-esx01:~] esxcli intnet fec get  -n vmnic2

Requested FEC Mode: Auto-FEC FEC Mode: No-FEC
[root@vcf01-prg-esx01:~] esxcli intnet fec set -m "No-FEC" -n vmnic2

ERROR: Unable to get/set info from the driver, Status: 1.

[root@vcf01-prg-esx01:~] esxcli intnet fec list

vmnic    Requested FEC  FEC
-------  -------------  -----

 vmnic0         No-FEC  No-FEC

 vmnic1         No-FEC  No-FEC

 vmnic2       Auto-FEC  No-FEC

 vmnic3       Auto-FEC  No-FEC

[root@vcf01-prg-esx01:~] esxcli network nic list
Name    PCI Device    Driver  Admin Status  Link Status  Speed  Duplex  MAC Address         MTU  Description
------  ------------  ------  ------------  -----------  -----  ------  -----------------  ----  -----------
vmnic0  0000:3d:00.0  i40en   Up            Up            1000  Full    a4:bf:01:83:ba:8f  1500  Intel(R) Ethernet Connection X722 for 10GBASE-T
vmnic1  0000:3d:00.1  i40en   Up            Up            1000  Full    a4:bf:01:83:ba:90  1500  Intel(R) Ethernet Connection X722 for 10GBASE-T
vmnic2  0000:86:00.0  i40en   Down          Down             0  Half    40:a6:b7:20:a2:10  9000  Intel(R) Ethernet Controller XXV710 for 25GbE SFP28
vmnic3  0000:86:00.1  i40en   Up            Up           25000  Full    40:a6:b7:20:a2:11  9000  Intel(R) Ethernet Controller XXV710 for 25GbE SFP28

[root@vcf01-prg-esx01:~] esxcli network nic get -n vmnic2
   Advertised Auto Negotiation: true
   Advertised Link Modes: Auto, 25000BaseCR1/Full
   Auto Negotiation: true
   Backing DPUId: N/A
   Cable Type: DA
   Current Message Level: 0
   Driver Info:
         Bus Info: 0000:86:00:0
         Driver: i40en
         Firmware Version: 9.40 0x8000ed12 1.3429.0
         Version: 2.7.2.0
   Link Detected: false
   Link Status: Down by linkflapping
   Name: vmnic2
   PHYAddress: 0
   Pause Autonegotiate: false
   Pause RX: false
   Pause TX: false
   Supported Ports: DA
   Supports Auto Negotiation: true
   Supports Pause: true
   Supports Wakeon: false
   Transceiver:
   Virtual Address: 00:50:56:51:7e:00
   Wakeon: None


[root@vcf01-prg-esx01:~] esxcli software vib list | grep intnetcli
intnetcli                      1.12.5.0-1OEM.800.1.0.20613240        INT     VMwareAccepted    2024-02-22    host
[root@vcf01-prg-esx01:~] esxcli software vib list | grep i40en
i40en                          2.7.2.0-1OEM.800.1.0.20613240         INT     VMwareCertified   2024-02-21    host
[root@vcf01-prg-esx01:~] vmware -v
VMware ESXi 8.0.2 build-22380479