Flint 2 horrible upload speed

Ehi,

i just bought a flint 2, but now i have a big issue over the upload speed. I’ve got a 2.5Gb/ 1GB fiber connection, but the upload speed has some issue i can’t fix yet.

Here some screen pre/post flint.

https://preview.redd.it/402klccoqj6g1.png?width=1106&format=png&auto=webp&s=39ca585c5137f220cd6241166969c76cbda31de8

as you can see upload speed has dropped 10x to 100x times!

Performing a speed test via ssh gives me this:

  Server: PVDataNet - Milano (id: 42070)
     ISP: Dimensione
Idle Latency:     6.07 ms   (jitter: 0.58ms, low: 5.30ms, high: 6.55ms)
Download:  1292.45 Mbps (data used: 1.8 GB)11.40 ms   (jitter: 2.06ms, low: 5.87ms, high: 53.59ms)
Upload:   688.29 Mbps (data used: 337.0 MB)12.22 ms   (jitter: 0.51ms, low: 6.08ms, high: 13.83ms)

so the problem, as far as i understand, is behind the router.

Google Gemini talks about some “FLOW CONTROL BUG” over the mediatek chipset and my ont (a ZTE unit), and suggest me this:

root@GL-MT6000:~# ethtool -a eth0

Pause parameters for eth0:

Autonegotiate: off

RX: on

TX: on

and turn them OFF via “ethtool -A eth0 rx off tx off”

I don’t try it yet.

There’s nothing special on the router, i set up one new vlan only, both wireguard and tailscale are off, adguard server off, no strange firewall rules, only dhcp and dns exception to the vlan itself. And the hardware acceleration was both on or off during the test.

Sorry for my english  and thanks for the help!