Upstairs I have my internet coming in with a Comcast modem/ router ( I will be bridging this b'cuz it sucks as a router). Also, I have my Dir 655 upstairs that I will use for wireless. and I have my dir615 downstairs and I want to use it as a basic switch/wired router. How do I set up my dir615 as a switch/wired router? Thank you for any help.