Cant able to browse the pages..

[getyourkarthick]

I am using ubuntu 9.04,after connecting to the net i cant able to browse the pages..When i enter a website it shows me the following error..

"The browser could not find the host server for the provided address.

* Did you make a mistake when typing the domain? (e.g. "ww.mozilla.org" instead of "www.mozilla.org")
* Are you certain this domain address exists? Its registration may have expired.
* Are you unable to browse other sites? Check your network connection and DNS server settings.
* Is your computer or network protected by a firewall or proxy? Incorrect settings can interfere with Web browsing.

Some one help me,thanks in advance..

[grishi_111]

have you checked your network connection?
if not do it.
try configuring network, setting static ip etc.

[getyourkarthick]

I am using two NIC cards,eth0 is assigned as dhcp and eth1 is set to be static..But after a restart eth1 is automatically set to be dhcp..How to solve it? What may be the problem?

this is my output of /etc/network/interfaces file

auto lo
iface lo inet loopback
auto dsl-provider
iface dsl-provider inet ppp
pre-up /sbin/ifconfig eth0 up # line maintained by pppoeconf
provider dsl-provider
auto eth0
iface eth0 inet dhcp