Flint 3 - Capped at 1 Gbps up/down

Routers
1

I have a 2 Gbps up/down service (DHCP).

Limit experienced on both wifi and wired.

Currently using the 4.8.4 snapshot (2025-12-11) firmware, after trying the 4.8.3 stable.

I stuck with mostly default settings initially. I have tried turning network acceleration on (both hardware and software) and off. No change.

LAN 4 is showing as 1000 Mbps full duplex, which clearly would cause problems on the wired front. I cannot find how to change that setting to 2500 Mbps. WAN automatically adjusted when I hooked up the service.

Even if I resolve that, it wouldn’t seem to solve the WiFi issue, however.

2

Make sure your cables support speeds higher than 1 Gbps (Cat 5e, for example, is only 1 Gbps).

3

This put me on the right track for the wired connection. I have a MoCA setup with Gocoax WM-803m adapters. Those were oddities in that they support 2.5Gbps over coax, but only 1Gbps over ethernet. Easy enough to upgrade those.

On the wifi front, I've tested with a Galaxy S25+ (wifi 7) and a Galaxy S24+ (wifi 6e), on all. I haven't gotten the full speed yet, but I'm finding big drop-off between the frequencies. Getting rid of legacy modes (a, b, g, n) does seem to help, interestingly.

For the S24+, down/up Mbps (without legacy wifi) and about 6ft from the router.

2.5Ghz: 88/60 (143/80)

5Ghz: 353/424 (1217/1054)

6Ghz: 762/901

MLO: 1240/1140

So, directionally correct but not yet all the way. Something going on there.

5

Hi

I assume the issue with the 1Gbps Ethernet negotiated speed has been resolved.

Regarding the Wi-Fi speed issue, could you please check the following?

  1. Verify that 160 MHz bandwidth is enabled on the 5 GHz band and 320 MHz on the 6 GHz band, as narrower bandwidths will limit achievable throughput.
  2. During the speed tests, what physical layer (PHY) Wi-Fi rates did the S25+ and S24+ negotiate? If there is interference or the distance is relatively long, the negotiated rates may be lower. If possible, please test again at a distance of around 0.5 m from the router.
  3. When testing MLO, try disabling the 2.4 GHz band on the client device. In some scenarios, the device may prioritize a 2.4 GHz + 5 GHz/6 GHz link, which can negatively impact overall performance compared to a 5 GHz + 6 GHz combination.
  4. What is the speed of devices connected via Ethernet cables?
6

Apologies for slow reply.

1). Check.

  1. S24+ achieving approx 1.32Gbps symmetric. Will check S25+ when it is home again.

  2. Disabled 2.4Ghz radio across the board, as have offloaded that responsibility to another router just managing IOT devices.

  3. Speed of devices connected by cable currently limited to 1Gbps due to hardware limits.

Hoping to upgrade MoCA 2.5 devices to non-Gb port versions soon to check those limits.

Incidentally, no real change with 5Ghz supporting AC or not.

7

Understood — the WAN interface is still limited to 1 Gbps.

In that case, you may consider deploying OpenSpeedTest directly on the BE9300 to test local Wi-Fi performance:

Please note that due to real-world factors such as wireless interference and client limitations, actual Wi-Fi throughput may not reach the theoretical PHY rate.

8

Upgraded the MoCA devices. Receiving the 2Gbps over wire now.

All appears well. I expect most WiFi related speed decrements are on client side.

By the way, the IOT network is running independently on an Opal router. Took a small amount of doing, but it is fully isolated. While seemingly less elegant than running off of the Flint 3, the advantage of dumping the 2.4Ghz radio on the Flint 3 seems with the price. Opal is fine for IOT, since they are good at the 2.4Ghz and most the higher levels of security found on newer routers are often not compatible with IOT devices anyway.

Thanks for the assist.