Eth1 - Lan1 speeds when using both ports as LAN

Hello everyone,

I'm seeking some assistance with a puzzling network speed issue on my GL-MT6000 (Flint 2) after reconfiguring one of its LAN ports.

My Setup & What I've Done:

  1. Port Reconfiguration: Following the instructions in the forum thread here, I successfully reconfigured one of my LAN ports (specifically eth1) to act as a 2.5Gbps port. This was done to connect another device at 2.5Gbps.

  2. Device Connections:

    • eth1 Port: Connected to a 2.5Gbps network switch. A device connected to this switch is confirming a 2.5Gbps link.
    • lan1 Port: Connected directly to another device, also confirming a 2.5Gbps link.
    • Both eth1 and lan1 interfaces on the GL-MT6000 are showing 2500 Mbps, full duplex.

The Problem:

I'm experiencing asymmetric speeds when transferring files between a device connected to eth1 (via the 2.5Gbps switch) and a device connected directly to lan1.

  • Download (from lan1 to eth1): I get the full expected 2.5Gbps speed.
  • Upload (from eth1 to lan1): The speed is capped at approximately 1Gbps.

Summary:

  • eth1 to lan1 (Tx from eth1): ~1 Gbps
  • lan1 to eth1 (Rx on eth1): ~2.5 Gbps

It seems that the eth1 port can receive data at 2.5Gbps from lan1, but when it transmits data to lan1, the speed drops significantly to 1Gbps.

What I'm Looking For:

I'm hoping someone might have insights into why this asymmetry is occurring. Is this a known limitation when reconfiguring ports this way? Could it be a CPU bottleneck, a driver/software limitation, or something else I'm overlooking in the router's internal handling of traffic between these specific interfaces?

Any suggestions for further troubleshooting or potential solutions would be greatly appreciated!

Thank you in advance for your help.

Edit: Updated my I225 driver to 1.1.4.43 from 1.1.3.28 and that solved the problem

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Thanks for your sharing the solution!