Sorry that i've not good explained my situation. Yes there is a school router which provides the second wifi signal and which has the possibility to connect also an ethernet cable :) I want to connect the Raspberry Pi (the Piratebox) to the school router so that the Piratebox could provide to all the clients (from the Piratebox) the connection to the Internet from the school router :). Short: take the Internet connection from the school router and provide it with the piratebox (but the piratebox should work too) :) .
Thank you that you help me :)
Thank you that you help me :)