Is there a tool you would recommend to check the Network?
There are some software tools to check your connection, many modern mainboards have one integrated in their BIOS/UEFI.
But, I don't think they are reliable.
I would recommend you to buy something like this. In my opinion it's an irreplaceable helper in a networked home.
Thank you for your recommendation. I used such device already and it told me all cables - 8 lines - are fine.
Well, our device does not test the shield. But it might be worth doing it again, because
i just had another look at the integrated check tools and it seems there are some issues.
When i installed my hardware one year ago i checked with this driver integrated tool and all was ok.
Now i got issues with cable quality, dont know how exactly the mentioned "16 meters" are.
So let me do some network research before reporting any logs or issues. Grml.