Ton modem Cegetel ... il ressemble a quoi ? Il a une prise RJ-45 ?
Si c'est le cas un routeur wifi classique à la manière d'un LinkSys WRT54G fera amplement l'affaire 
http://www.ldlc.com/fiche/PB00016948.html
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Hello IT ... Have you tried to turn it off and on again ? ... The button on the side, is it glowing ? ... Yeah you need to turn it on ! ... The button turns it on ? ... You DO know how a button works don't you ! ?
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