GS110-MX supports only one-way transmission. 5-10Mbps in the opposite direction.
GS110-MX supports only one-way transmission. 5-10Mbps in the opposite direction.
Hello! Welcome back to the 10G Ethernet Troubleshooting discussion. I recently acquired a used GS110-MX with two 10G and a couple of 2.5G/5G ports. One port only sends data, not receives. I ran an iperf test from PC to NAS and from NAS to PC. The issue seems consistent across multiple PCs. Using other 10G switches worked without problems. It's worth noting that the port is labeled as 10G with both green lights on, but it appears Port 9 isn't functioning properly. When I switch between NAS and PC ports on the switch, sending speeds increase rapidly while receiving remains slow. The previous owner mentioned the switch operated normally, but they can't confirm anything further. Any suggestions would be appreciated! THANKS! P.S. The 9Mbps speed is actually quite fast—usually it's around 5Mbps, so it's unlikely the port is stuck in a higher bit rate mode. More clients usually improve performance slightly, though not dramatically.
Have you considered disabling all switches at once and linking the computers directly? I suggest attempting to boot into Linux via a USB drive and executing the diagnostics there to determine whether the issue stems from software or hardware.
Reviewing everything suggests the ASIC handling the port switch might be faulty—possibly due to wear, production flaw, or environmental stress like lightning or static. You could use WireShark to monitor traffic and detect abnormal data flow, which would indicate a problem with the port. Testing at different speeds (2.5Gbit vs 1Gbit) might reveal inconsistencies. If you're willing to risk it, disassembling the device could uncover loose connections or other physical issues. It seems you've narrowed down likely causes.
I've noticed problems with upstream on Windows starting around September across all my PCs, whether wired or wireless. I reduced the impact by turning off interrupt moderation on network adapters in both Windows and my Linux server. It seems checking Linux might be a better approach since it would likely resolve the issue without changes. I also faced many issues with my GS110EMX until I turned on flow control; however, since you have the unmanaged version, that adjustment isn't possible. It probably wasn’t the main cause, as similar speed limitations occurred when connecting to a 10Gb server over Gigabit—TCP/IP didn’t properly throttle the traffic, causing the client to send data much faster than it could be received.
You can check if it’s working by testing different network interfaces. Since 1G is functioning, it suggests the issue might be specific to another adapter or driver. If other switches work fine, the problem likely lies with your current setup or a particular device.
Implies the chip handling device for that port is struggling with the 10 Gigabit speed. It needs to run faster than at 1 Gigabit. You might have overlooked it, but did you attempt to change the cables? It could be a rare production flaw where the specific maker dislikes your cable.