[ubuntu] Can't connect to internet on 10.10 x64

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http://ubuntuforums.org – I've installed ubuntu 10.10 dual booting with win 7. My internet connection is Direct DSL wired line to my modem. I dont have any wireless connections. I even got connected using live CD of Ubuntu and after my installation too I got connected for the first time, very well without any problems. But eventually after updating my system using update manager and then reboot I couldn't get a connection. Even now, just using my live CD I can connect to internet.. but not with the actually Ubuntu Installed. Maybe this info can be helpful ifconfig -a output Code: eth0      Link (HowTos)