We set up a virtual LAN using Radmin LAN, but when using the built-in file sharing in Windows, the speed was limited to 1Mbps or even lower (both my network upload speed and the other party's download speed were 50-100Mbps). Later, we tested the network speed through iperf and found that the connection speed was normal under TCP environment, but as long as we switched to UDP, no matter who sent the file, the speed was around 1Mbps. What is the problem
There are a lot of factors like many routers between Radmin VPN and Internet, NATs, firewalls, network topology, router settings, closed ports and etc. And also torrents, network channel congestion and Windows updates.