We have recently installed Windows Server 2012 R2 in our school.
I noticed, that bandwidth to one client is somehow limited to around 30mbps.
This server is gateway to internet.
When we had UNIX box, no problems occurred regarding speed.
AD is not set to limit bandwidth, as it was everything fine, when UNIX box was in place.
What could be the culprit? Tried various hints, such as https://www.duckware.com/blog/how-windows-is-killing-internet-download-speeds/index.html , but none seems to work.
We have: Gateway - Windows Server 2012 R2 (Routing, DHCP, WSUS, Firewall) (WAN IP) DC - Windows Server 2008 R2 (Apache, MySQL, FTP) (SpeedTest Mini) (LAN IP) Client - Windows 10 (x.x.4.1) firewall rules, to redirect WAN IP to some ports, including 80 to LAN IP
Scenario 1: Client runs speedtest on WAN IP - speed around 30mbps.
Scenario 2: Client runs speedtest on LAN IP - speed hopping nearly 100mbps
Scenario 3: DC runs speedtest on WAN IP - speed around 30mbps Basically it runs speedtest to itself, but through gateway
Scenario 4: DC runs speedtest on LAN IP - speed around 200-300mbps - still, it is internal traffic, in same box
Scenario 5: Gateway runs speedtest on LAN IP - Download speed hopping nearly 100mbps, Upload around 22mbps
Scenario 6: Client runs speedtest on WAN IP - Download speed hopping nearly 100mbps, Upload around 22mbps
Scenario 7: Gateway copies file to Client - around 100mbps
Scenario 8: Gateway copies file from DC - around 30mbps
EDIT Scenario 9: 3 Clients runs speedtest, all get 30mbps. It seems, that it is limited per client, but as I said, this was not an issue with UNIX box
EDIT 2: Scenario 10: Client copies files from DC via local share (LAN IP) - around 100mbps