timpecter

With the PC and Mac and Router plugged into the switch I can ping the PC from the Mac with similar results as above but ping from PC to Mac returns "Destination host unreachable" and neither PC nor Mac can access the internet nor reach the router.

Thanks for the instructions - With ONLY the PC and Macbook connected to the switch: From PC to Mac: From Mac to PC:

By configuration, I mean I just returned the physical cable connections to their original state. Network topology - see attached. Can you please give me specific instructions for pinging between my devices? I only have the PC wired to the switch wired to the router, as shown in my diagram. I could attach another device via…

Hello, thank you for your response. See my replies below: Yes, prior to the issue the switch operated normally. I had not made any changes to the network connections or configuration. Incidentally, after the issue arose I tried a number of different connections with no success. I did return it to the original…