I have a switch on which all the network lights are going crazy on and none of the systems have network access or internet access. Below is my detailed configuration. I have 2 routers (DLink and Beetel) and one dlink 16 port switch.
The first DSL router that provides Internet access, has 4 ports. Port 1 and 2 are connected to 2 desktops. A straight cable goes from port 3 to 16 port dlink switch to provide internet access to 7 other computers.
There is a crossover cable going from the last port into another wireless router 18 feet away acting as access point for laptops.
The Dlink switch is an unmanaged switch, with no uplink port.
The network lights are blinking like crazy and no internet access or network access is taking place.