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Every time I want to visit a website, I first get

Unable to resolve the server's DNS address.

Doesn't matter what browser. When I refresh a couple of times, the page opens.

I tried flushing my DNS cache, and reinstalling network adapter driver. Didn't work.
I tried using Google's public DNS server (, still didn't work.

I tried debugging DNS lookup with this command:

nslookup -debug

and it worked sporadically. It would work a couple of times, and then for 2-3 minutes it would return "DNS request timeout". All the while a torrent file is happily downloading in the background, so I guess new connections are a problem.

When I use other computers on my network, everything works OK. I'm using cable connection, not Wi-Fi.

How can I troubleshoot what's going on with my networking?

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Wireshark and a book on TCP/IP (Comer, Stevens, ...) – RedGrittyBrick Nov 22 '12 at 14:51
It's been long since I've learned about Wireshark in college. @RedGrittyBrick do you mean that Wireshark could help me with my particular problem? – ttkalec Nov 22 '12 at 14:55
Yes, I'd use it to see what is being sent where. – RedGrittyBrick Nov 22 '12 at 14:59
Tnx @RedGrittyBrick, I'll try it. – ttkalec Nov 22 '12 at 15:08

what is the best way to troubleshoot what's going on with my networking?

I'd use Wireshark to see what is being sent where

and a book on TCP/IP (Comer, Stevens, ...) to understand why.

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