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Beginner
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Internet speed is reduced to one quarter when connecting devices

Hello all,

 

I hope you can help me with this, which is driving me nuts.

 

I have the following setup at home:

 

https://dl.dropboxusercontent.com/u/10415734/20161103_195844.png

 

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?

 

Thank you!

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Beginner
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Message 2 of 3

Re: Internet speed is reduced to one quarter when connecting devices

oh... and I also tested with different cables, that also did not change the outcome.
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Beginner
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Message 3 of 3

Re: Internet speed is reduced to one quarter when connecting devices

Noone has something to contribute ?

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