How can I access my Internet wirelessly?

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http://askubuntu.com – I have the most recent Ubuntu 12.04. I can access the Internet by cable anywhere, and I can access a neighbor's Internet connection wirelessly, but I cannot access my own internet wirelessly. It shows up as having an "excellent" signal, but it the actual Internet does not show up. Firefox tells me that I am experiencing an Internet connectivity issue. I am running a dual-boot with Win7, and it all works fine there: no such problem. What do I do? ifconfig command gives: thomas@ubuntu:~$ ifconfig eth0 Link encap:Ethernet HWaddr f0:bf:97:05:e0:c9 inet addr:192.168.100. (HowTos)