I have a 100 Mbps fiber connection I'm connecting to over WiFi (ASUS PCE-AX58BT AX3000 Dual Band - Intel Wi-Fi 6 AX200 160MHz), though note that the routers do not support WiFi 6 (NETGEAR R6200v2 -> ZTE F660). Recently, after creating a Hyper-V Virtual Switch on Windows 10, I started experiencing slow upload speeds, but not download. After a lot of experimentation and research, I figured out that disabling Large Send Offload v2 IPv4 would seem to fix the problem. Additionally, deleting the Network Bridge, thereby converting the External Virtual Switch to Internal also seemed to fix the Upload speed issue.
I would like an explanation on the situation.
- Why only with the Virtual Switch/Bridge
- How does the workaround work?
- Why upload and not download (The research I did online seemed to suggest this issue also impacted download, but maybe it was when communicating between local Windows machines)?
- Does this issue impact only certain hardware, as a certain laptop didn't exhibit this issue.
What I suspect is that when Bridged, windows erroneously tries to use offload on hardware that does not support it, but I'm not sure.
