Since you're using a Linksys router, I suspect you need a DHCP-assigned IP address. Also, your IP address should not be in the range of 169.254.x.x, as that means your card is recieving an IP address through its connection. If it happens, press the "Renew DHCP client" button in the System Preferences->Network->TCP/IP panel.
Below, I have attached how it should look.
Hope this helps
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