It sounds like you need to set up your ISP's nameserver in resolv.conf. Log in to your router and see what the DNS server is. Then enter that into resolv.conf
Code:
nameserver xxx.xxx.xxx.xxx
The only thing I don't like about setting up static network settings like this is that my ISP has a nasty habit of changing their DNS server's IP address occasionally, and then one day, I suddenly can't access the internet, but everything else seems to work just fine...