SMB Multichannel does not multichannel

Hey, so I bought a new motherboard, and it comes with two NICs, 1GbE and 2.5GbE. Coincidently, those are also the ports that are on my NAS, so I wanted to set up SMB Multichannel.

Firstly, the setup:

  • 2.5G ports on my NAS, and my PC are connected to a MikroTik CRS310-8G+2S+IN;
  • 1G ports are connected to my UDM Pro;
  • 2.5G ports are running on default VLAN - 192.168.68.1;
  • 1G ports are running on a second VLAN - 192.168.10.1;
  • NAS running TrueNAS Dragonfish-24.04.2.5;
  • PC running Windows 11 23H2.

All NICs are configured on both devices, each one having their own IP addresses, and all NICs on separate subnets.

Everything seems to reach each other - I can ping all NICs on my NAS from my PC, and vice versa, I can run iPerf via both subnets, and they reach their speeds of 2.5G and 1G.

All NICs support RSS (irrelevant devices removed to save space):

Interface Index RSS Capable RDMA Capable Speed    IpAddresses                               Friendly Name
--------------- ----------- ------------ -----    -----------                               -------------
12              True        False        2.5 Gbps {fe80::6ebc:aa:57e4:3331, 192.168.68.235} Ethernet 8
20              True        False        1 Gbps   {192.168.10.20}                           Ethernet 4

The only issue I find is that only the 2.5G NIC shows up on Windows, where all of a sudden the NIC is no longer RSS capable (I did enable multichannel and direct SMB):

 Server Name Selected Client IP      Server IP      Client Interface Index Server Interface Index Client RSS Capable Client RDMA Capable
----------- -------- ---------      ---------      ---------------------- ---------------------- ------------------ -------------------
Truenas     True     192.168.68.235 192.168.68.114 12                     2                      False              False

I have also tried connecting the 1G links as DAS, setting both ifaces onto a bridge, setting one of them onto a bridge, and so on, with no improvement.

Adding some relevant screenshots, let me know if anything else is needed and I'll post it:

Two spikes are iPerf tests

https://preview.redd.it/qyn8567zouce1.png?width=2283&format=png&auto=webp&s=8bbbc9bc0571bf70046a49153bd8eb1347ed8f41

https://preview.redd.it/3asyork0puce1.png?width=1642&format=png&auto=webp&s=16453baf2589a1d8717222a5d789f9132d0721cb

https://preview.redd.it/p6tbj2k5puce1.png?width=490&format=png&auto=webp&s=a5bf82d88468a9a8a2fdc34406cae64d84d9e12d