I'm using a jetway motherboard with a 3x Intel Gig daughterboard. I have a dedicated LAN port on the motherboard and the guest port is on the duaghterboard. Both connect to a netgear managed switch. As mentioned, I have recently changed to a new managed netgear switch. This setup worked fine for a several years. While writing this however it dawned on me that while I had other interfaces working on that daughterboard, that does not mean that this interface is still in physical working order. I have moved my guest network to an open port on that same daughter board and will be testing it out.