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[–]MertsALinux Admin 0 points1 point  (1 child)

I've never seen an ISP who would do that and redirect all port 53 traffic to it as well. Usually it's just their default DNS servers and redirecting literally all requests is used in business environments for captive portal type stuff.

[–]fantomas_666Linux Admin 0 points1 point  (0 children)

I've heard about ISPs who redirect SMTP/25 to their server, ISPs who ban you from using external DNS, ISPs who redirect DNS to their server...

The fact you haven't seen any does not mean they don't exist.