This message was posted on behalf of Intel Corporation
Thank you for posting at Wired community. With regards to the issue encountered, can you check the corresponding setting on the router/switch that connects to the ISP. Please ensure the same speed and duplex setting on both the router/switch and I218 . e.g. If you configured as Auto negotiation on I218, the same should be applied to the router/switch.
As I218-V is an onboard NIC, what is the brand and model of your system? Is the driver you downloaded from the board vendor? We have Intel driver available for download but this is generic version we do not guarantee 100% compatibility.
Have you contacted the board vendor to isolate the issue since this is an onboard NIC, it is recommended you contact the board vendor for further assistance.