Windows Guest VM not internet on Ubuntu KVM

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http://serverfault.com – I installed Windows 7 as a guest in KVM running on Ubuntu 12. Windows seems to be running fine with the exception that it can't access any external domains or IPs. The guest can ping the host's IP and the host can ping the guest's IP, but that's it. I used the default NAT setup, which others have reported should work. What can I do to fix this? (HowTos)