I have both IPv4 and IPv6 internet environment and I found the ‘Realtek USB GbE Family Controller’ prefers IPv4 over IPv6.
The IPv6 also works without any problem.
But the adapter prefers IPv4 over IPv6.
Finally, I changed ‘ARP Offload’ to ‘Disabled’ in the adapter settings and the adapter became prefers IPv6 over IPv4.
I have a Surface Pro 3 with Microsoft Docking Station, and the system is Windows 10 pro. I have both IPv4 and IPv6 internet environment.
I found while I uploading a large file, the network adapter will be broken. But it worked normally after I disabled the IPv6 protocol.
I found it was a driver problem. I changed the driver to ‘Realtek USB GbE Family Controller’ manually.
After I changed the driver manually, the adapter’s name became ‘Surface Ethernet Adapter’ again because they use the same chipset, also a Surface setting inside the driver.
Finally, the ‘Surface Ethernet Adapter’ works without any problems while you are using both IPv4 and IPv6 internet environment.