MT3000 4.11.0 Beta WireGuard WiFi issues

Router
24

Hi,

Thank you for providing remote access.

We performed an initial check and found the following:

  1. The path MTU is 1492. Considering the WireGuard MTU and the previous lower-MTU tests, MTU is unlikely to be the cause.
    image

  2. An OpenVPN UDP profile in the same geographic region can achieve much higher speeds on this connection—over 80 Mbps download—so this does not appear to be a general upstream UDP limitation.

  3. During the speed tests, both CPU cores remained at only around 30% utilization, so CPU saturation is not the cause.

  4. A direct iperf3 test to a server we control reaches over 80 Mbps, while the same test through the WireGuard tunnel reaches only around 13 Mbps.

  5. We could not reproduce the issue locally using another MT3000 running v4.11.0 release, the same WireGuard profile, and a 5 GHz repeater connection. This suggests that the issue may depend on this device’s configuration or its current network environment, rather than being a general firmware issue.

Could you please help us with two further tests?

  1. Connect the MT3000 to another network, such as your phone’s hotspot, and check whether the issue still occurs.

  2. Export a configuration backup, factory-reset the MT3000, and configure only the Internet connection and WireGuard profile. Please test the speed before restoring the backup.

    You can restore the backup afterward to recover your other settings. However, if the problem disappears after the factory reset, restoring the old backup may reintroduce the configuration responsible for it.