I bought Archer A7 because it was supposed to have a print server. On your webside A7 model is advertised with this functionality. But it doesn't have it. So I am trying to connect to A7 router an external old DL-301U usb print server by ethernet cable and I can't ping it and display its web interface. When I connect DL-301U directly to my computer, it is OK, when I connect it to router it is not response. Where is the problem. I think that A7 blocks the connection, but I am not sure. What can I do?