I have an SR520 router connected to a CE520 switch. That switch is then daisy chained to a second CE520 switch via the Gig ports. All works great. I now need more connections than we have wiring for at one persons' desk. So I put a small 4-port Linksys switch at her desk and plugged her computer and printer into the Linksys switch. Does not work. The CE520 switch grabs which ever MAC address it sees first and rejects the other one. The log files with errors about the "invalid MAC" or whatever. I have set the port on the CE520 as a "trunk" port but still no go. Help???