OK, here's the deal. I've set up my network at my parents place thusly. I'm running a Buffalo WZR-HP-G300NH router using DD-WRT v24-sp2 (06/23/14) std. The Comcrap modem is plugged into the WAN port. I have my mothers PC (MOMPC) plugged into port 4 on the router. I have a line running from Port 1 on the router to Port 1 on a TrendNet TEG-S5g 5 port Gigabit switch. My server, LARGO, is plugged into Port 2 on the TEG-S5g, my MyCloud EX4 is plugged into Port 3, and a line runs from Port 5 to Port 1 on an 8 port TEG-S80g switch in my bedroom. My Roku is plugged into Port 2 and my PC is plugged into Port 3 of the TEG-S80g. Here's the problem. Everything wireless can talk to LARGO and the MyCloud without issue. Any PCs plugged into the router via wire cannot talk to LARGO or the MyCloud, pinging gets a "Destination host unreachable" error. Anything wired plugged into either switch talks to the server fine. Anything wired connected to the router can talk to each other fine. I'm not a moron when it comes to networking but this has me stumped. Any help?