[expert] ISP connect

[george r.]

How can I find the domain name and the DNS IP address of my ISP? I 
can't contact them (their website is unreacheable) to find out if something 
has changed. However, everything worked since a couple a days ago, 
but now I can browse only through windows, but not in linux (on two 
machines). So, what options do I have to be able to browse under linux 
again? 

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George