According to Xs4all security officer Arjan van Hattum, such a filter must prevent malware contamination, but it must also prevent malware present on a system from communicating with a c2 server. Customers have the choice to manually switch on the filter, which is turned off by default. On a special page , the provider gives more explanation about the filter. It says that it is active within one minute after switching on.
The filter also applies to all devices that are connected to the Xs4all FritzBox router within the home network. Users can not call a filtered page. The provider was not available for the question which service is used for filtering.
Dns filtering is not a new service, different parties already offer similar services. For example, Quad9 , which also claims to protect users against malware. Cloudflare recently also released its own version. In addition, there are alternatives such as OpenDNS, Comodo, Google and Norton. Not all variants offer filtering of malware domains.
Update, 13:11: Xs4all tells Tweakers that blocking is done on the basis of lists from Spamhaus . Filtering takes place within the provider itself.
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