hello,
I have a HP ZBook 15 laptop, where the "Intel(R) Ethernet Connection I217-LM" device is used for wired Ethernet. I also have two GO-SW-8G Dlink Gigabit switch (https://eu.dlink.com/se/sv/products/go-sw-8g-8-port-gigabit-dlinkgo-switch ). Below, I will call these SW1 and SW2, for better understanding. Also from the Internet Service Provider, we have 1 Gigabit/sec bandwidth (T-Home Magenta1 pack).
There are two scenarios what I setup and the 1Gbps speed was not able to work (?) in the laptop in one case.
The scenario-1, when the 1G speed was working:
The internet modem is connected with a standard LAN cable to the PORT-1 in of the SW1. The Ethernet interface in my laptop is connected to the PORT-2 in SW1 with a standard LAN cable. In this case the Ethernet interface LinkSpeed was Gigabit. It was possible to see both in the indicator LED of the PORT-2 in SW1 -this was green-, and also in the Windows when checking the LinkSpeed of the Ethernet interface, please refer to this link, Google Photos
So, in Gigabit speed point of view there is no any issue in this scenario.
The scenario-2, when the 1G speed was not working, and the LinkSpeed down set to 100Mbps:
Just similar to scenario-1, the internet modem is connected with a standard LAN cable to the PORT-1 in of the SW1. Now SW2 comes to the path, thus PORT-2 in SW1 is connected to PORT-1 in SW2 with a standard LAN cable. The Ethernet interface in my laptop is connected to the PORT-2 in SW2 with a standard LAN cable. In this scenario, the indicator LEDs on the Dlink switches are green, meaning 1G speed in all used ports, except the PORT-2 in SW2 which goes to the laptop. The indicator LED was orange of this port, also checking the LinkSpeed in the Windows side, that shows 100Mbps speed, please refer to this link, Google Photos
I have tried set manually the LinkSpeed in the Windows for the Ethernet interface to 1G, but in this case the interface was "disconnected", so the wired Ethernet was gone in the list of connections in Windows and the laptop has started to use my WIFI NW.
When I changed back the interface LinkSpeed to "Auto", that come back to 100Mbps, and the "internet connection" returned to use the wired connection.
I did other test by using another Gigabit device, what was a Gigabit router from Dlink, and when I was connect one of the LAN interface of the router to the PORT-2 (or 3, or so) in SW2, the indicator LED was green, meaning the speed was 1Gbps.
Last week, I was issued a support ticket to Dlink, but finally they have not seen any issue with my setup in their pint of view, and also got the info from them, the scenario-2 was working very well with 1G in their LAB.
Thus now, I think the problem is not with the Dlink switches, but with the Windows and/or I217-LM device, and I would like to get some instructions, hints, ect from you, about doing some kind of troubleshooting to identify the root of the issue I have.
This morning I just refreshed the driver of the I217-LM to "Intel ® Network Connections Version:"22.9.6.0"", but I got the same result, so the expected 1Gbps LinkSpeed is not seen when both Dlink switches are in the path.
For more detail info about the drivers on my laptop, please refer to the attached text file.
Please try help me.
Thanks for your help,
/Robi