[ubuntu] How to set up the wi-fi using a wired Ethernet cable?

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http://ubuntuforums.org – Hi, I am using Ubuntu and need to set up the wi-fi. My current internet connection is via a wired ethernet cable without a Modem. But in almost all the cases of setting up process they say,"Connect the wire from the modem to the router.", while setting up the router. So in my case where I dont have a modem, so do I just need to connect my ethernet wire to the router while setting up? Secondly , will all the settings will be lost when the router will be rebooted? (Hardware)