Hello,

I'm encountering a strange problem. When I connect my raspberry pi 3 over ethernet, all my other devices (connected over ethernet or WiFi) are slowed down from 8 Mbit/s to 1,5 Mbit/s.

When I shutdown my raspberry, but leave the power supply attached to the raspberry, as well as the ethernet cable, then I get an improvement of 0,5 Mbit/s. Only when I disconnect my raspberry from power or detach the ethernet cable my bandwidth goes back to normal.

How is this possible? Could someone help me to figure out a solution?

P.S. I already tried to move the raspberry far away from the router, and I also tried to use another ethernet cable, but nothing changed.

Is it enforcing 10 Mbit traffic instead of 100Mbit?

First of all, many thanks for your rapid answer.
How can I check that? Are there any config files where I can edit it?

Raspi 3 network bus shares the USB bus.

Refer to http://raspberrypi.stackexchange.com...ame-controller

This would explain, why my Wifi speed is higher than my ethernet speed. But there is one open question: why is my entire network affected, by this slow down?

Are you connected to a hub (as opposed to a switch)? Typically a hub will slow down the entire network in which it's connected to match the slowest connected device.

That Pi of yours has a hardware problem. If it is new and under warranty have it replaced.

No, I'm not connected to a hub.
@Emerson: Yes, it could be, for this reason, these days I'm gonna try to attach the Pi at the network of a friend. If the problem persists than it's for sure a Pi Hardware problem and I will send it back.

But what other factors could influence it? Could the router/modem play a role in this problem?

I don't think so, the problem seems to be at physical layer.

It doesn't make sense that the Pi would slow down the whole network. OP mentioned slowdown happens over both wifi and hardwiring. Neither case should slow the whole network with a modern (<10 years old) router. The router should only slow the negotiated route of the device. Consider upgrading the firmware of your router as a possible solution.

You can use mii-tool command to detect the current speed of your hardwired Ethernet.

If you get one box, load an ftp server on it, and transfer some files with just the two of them in a network, you can check your Pi. At about 10 bits/byte transferred, 10Mbit/S = ~1MB/S and 100Mbit = ~10MB/S.

I'm already using the latest version of the available firmware. But unfortunately I'm using the router provided by my ISP, so that I cannot flash OpenWRT on it. It's a SERCOMM router, called Easybox 804 (not very popular).

@business_kid: I did this test, using SCP (Cyberduck), transferring a large file (10GB) from my computer to the pi, and the average speed was about 9MBit/s.

So I run the command mii-tool and this is the output:
Another strange thing that happens, is that when I connect the ethernet cable to my raspberry the router, loses connectivity to the internet and after that it connects and synchronises, so that I get a new public IP.
In order to get full speed again, I have to reconnect my router, so that it synchronises and gets a new public IP again

Is your pi power supply plugged in close to your router? Maybe the power supply has a problem and it is causing interference on your phone line.

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@af7567: Yes it is. I will try to move it away and will then post the result.