One computer can't access wifi?

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I have a wifi router running which gives my phone Internet fine. But my Mac does not have an Internet connection. It gets an ip in the same range as the phone, but No Internet access. I can't get access to the router or ping response from the router either. I can, however, ping the phone from the Mac.

Occasionally I get Internet for a second after rebooting the router. But it cuts out before even loading a complete Web page.