Ethernet connection is aktive but Safari is not able to detect internet

The network diagnostic assistant tells me that my internet connection works fine and skype also works fine. However, when I start Safari (or Firefox) I get the message that the computer is not connected to the internet. This problem comes and goes, sometimes I am able to connect to the internet, and sometimes not.
Does anybody has an idea where the problem might be?
Thanks

By the way, in case you (or someone else) does not know what a DNS server is and does, let me explain (OK, I copied and pasted from Wikipedia): "The Domain Name System (DNS) associates various information with domain names; most importantly, it serves as the "phone book" for the Internet by translating human-readable computer hostnames, e.g. www.example.com, into IP addresses, e.g. 208.77.188.166, which networking equipment needs to deliver information"
In other words, every website you type in is actually a series of numbers called an IP address. The DNS servers look up the website name and direct you to the actual IP address. For example, when you type in "www.apple.com" the DNS server looks up Apple's IP address (it happens to be 17.112.152.57 [they actually have more than one]) and directs you to that website.
So if your Internet is on again, then off again, it could be that the DNS server that your computer is using is sometimes available and sometimes not.

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