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I have a GS3025e connected via CAT6 to my ISP provided router. I then connect my PC, a NAS and a work Surface to the switch via Cat5/Cat6 LAN.
For 2 months it's been fine providing me with my ISP maximum Internet speeds of ~37Mbps. Oddly, tonight my internet speeds drop to something like 0.2Mbps (I couldn't even load Goggle and Speedtest.net wouldn't connect to the test server.)
I did the obvious such as check cables, reboot my router and so on but as soon as I took the Router to Switch LAN cable and connected directly to my PC, my speeds went right back up to where they should be. Put it back so it's Router > Switch > PC and the speeds drop to pretty much 0 again. I've tried several cables between the Switch and the PC and all are giving the same result.
I've tried removing all the cables except the Router > Switch and Switch > PC but no difference.
I've tried the cables in different ports (even though I know it shouldn't actually matter) but no difference.
Thank you so much for getting back to. Sorry to wate your time though, I've found the solution.
I use Powerline adpters throughout my house and 1 of them was behaving oddly.
Although I have one powerline connected to my switch (which was correctly being identifed as the 'source' (ie, the one connected to the internet source), a 2nd one starting acting is if it was the source, where is in reality, it was should have been a provider.
Suffice to say, once I disconnected that Powerline adapter, everything returned to normal. I'm going to open a support case with Devolo asking the question about uising powerline via a switch or should the 'source' adapter be conencted directly in to the router.
