SoftEther VPN User Forum

I have Win 8.1 64bit client build 9599 and a Win10 64bit client build 9599 behind NAT connecting to a 2008 64bit server 9599 with no NAT

The server has one Virtual Hub, bridged to the inside LAN interface.

I have noticed that downloading (to the client) is suddenly extremely variable (it used to work fine - I could stream HD video over SMB, etc). Upon closer inspection I have noticed I am getting, at best, half throughput (eg; using speedtest.net through the VPN yields 15mbps peak where my connection at home is 30mbps), and SMB performance is terrible.

However, if I check the task manager in windows, the physical interface shows it is receiving ~30-32mbps of traffic.

Absurdly, upload speed is still fine - 30-32mbps of physical interface traffic ~= 30mbps of throughput on the VPN

Both the server and the clients have been rebooted since this started.

I tried reducing the number of connections in case there was some weird issue with traffic being sent twice down multiple connections, but exactly the same behaviour is seen with 1 connection.

How do I begin to troubleshoot this?

I've attached the server configuration; as you can see, it's pretty basic.

This is still happening. 100mbps pipe, 91mbps consumed, but only ~43mbps payload data.

Upstream won't go much faster than around 35mbps still, though, which doesn't make much sense to me, but at least when it's doing that, it's only consuming ~35-37mbps on the wire.

This is on a different client machine (now w10 64bit, previously w7 64bit). Server (w2008 64bit) and client software now both 4.21 9613.

Nobody else is seeing this?

Try to capture packets on virtual NIC of client side.