I hope you can help me with this, which is driving me nuts.
I have the following setup at home:
BT: the router from BT providing internet connectivity (which is attached to a fiber modem, which fiber modem connects to the house master socket).
SW: various gigabit switches
Sy: My Synology, but that can be any device there, the behaviour is the same (so either my Ubuntu box, or my Hometheatre server, or two or three of them - but any ONE of them is enough)
PC: My main PC upstairs in my office
box with antenna: a d-link access point for connecting mobile devices.
Problem: if anything is connected to the switch that the Synology is connected in the drawing, I get 20Mbps from speedtest.net and from BT's speed diagnostic.
If I skip the switch and connect a device directly to the switch the BT router is connected to, I get again the same low performance.
If nothing (from the stuff in the living-room) is connected to the switch, I get 75Mbps from speedtest.net and BT's speed diagnostic.
All links are gigabit ethernet, except between BT router and switch, which is 100Mbps
I have absolutely no idea why this happens... Anyone care to suggest something?
Noone has something to contribute ?