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If I connect my laptop (windows vista) on my router via cable than I have network and internet,

but if I do it via WiFi the network is identified as an unknown network with limited access and I can't ping the router, also I see other computers in my network folder but I can't ping them

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What's your router brand/model? – hyperslug Aug 12 '10 at 8:08
TP-Link N router, this is his user guide – Omu Aug 12 '10 at 10:05
up vote 0 down vote accepted

it was the atheros wifi driver, I had to update it

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