No Internet

Hey,

Since last night i cant load anymore websites. I get the message DNS lookup failed. When i connect the cabel from my modem directly into my laptop then i do have internet, but when i put my ethernet cabel from my router into my laptop then i dont have internet and i get the message ''DNS lookup failed''. I use google chrome as browser. I already searched in other threads but nothing worked so far. Can someone help me to fix this problem?
 
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