[ubuntu] resolv.conf doesn't work?

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http://ubuntuforums.org – My network works before but now it has follow issue, when I ping google.com, I got Quote: ping: unknown host google.com but my network still works partially because I can still connect to a DNS listed in my /etc/resolv.conf to get host google.com's ip adress by Quote: host -t a google.com ip.of.one.dns and then I ping the returned IP result, the ping works fine. the issue is that I can't connect to Internet, what I can remember is that I ever removed /etc/resolv.conf and this file was created again by networ (HowTos)