What do DNS servers do

Internet DNS server is not responding - what to do?


There are moments when you want to bite the edge of the table: Despite the broadband line, the Internet is excruciatingly slow and it feels like it takes forever to access the website. As a rule, the fault is not the DSL or cable connection itself; the router is also innocent. No: The cause of sluggish Internet is usually the provider's so-called DNS server. DNS stands for “Domain Name System” and translates URLs such as www.heise.de into the IP addresses required for the Internet. If this server is overloaded or simply slow - and that can change depending on the time of day - every visit to websites becomes a torture, as many domain name addresses have to be resolved. In contrast, the use of another, more reliable DNS service provider helps: Google offers such a server. But there are also other providers such as OpenDNS or Quad9. Without special functions, alternative DNS servers are usually free of charge - and significantly accelerate the Internet connection.

Set up an alternative DNS server in the router

There are several ways to set up an alternate DNS server. It is ideal to store this in the router: This way, all devices in the WLAN / LAN network can use the DNS and the Internet speed is quickly done without any further device-side setup. We show an example of how it works with a FritzBox. However, most routers offer the option of storing an alternative DNS server.

Enter alternative DNS server under Windows

Of course, there is another way: If you have a notebook, you can of course skip the router's DNS and use your own DNS in third-party WLANs, for example, to optimize the speed. This is done quickly under Windows:

Change DNS server on macOS

It is also possible to change the DNS server quickly under macOS. The procedure is a bit simpler than under Windows, but basically the same: