I am using a desktop that has two Linux distros and Windows 7 installed, and a laptop with same installation. Both of them are in my home network. And sometimes when I try to visit some websites such as Google, BBC or any of them, it is trying to sell for example google.com domain to me; I face with that picture(instead of 7sabah there has been the website that I am trying to visit.):
No matter which OS ,computer or browser, same problem stands. And I think it may be DNS Hijacking but not sure. The link (can be seen in the picture as 'click here') redirects me to '4.cn' website although I am not living in China. Are there any ways I may use to check whether it is a hacking or not?