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A comment on The NSA and CIA use ad blockers. Parent comment

Re:The NSA and CIA use ad blockers by blitzar on Thursday September 23, 2021 @12:51PM (#28631765)
I expect they mean bypass your networks DNS completely and use hard coded ip's or a hard coded DNS (with some way to obscure it).

DNS filtering and blocking is a very powerful tool great for bypassing many features/pitfalls of the internet.

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Re:The NSA and CIA use ad blockers by BeefWellington on Thursday September 23, 2021 @08:46PM (#28637380)
If you have the commitment to it, you can simply force all outbound connections not originating from your DNS servers to be NATed TO your DNS servers.

I do this; no machine other than my 2 DNS servers are permitted to make outbound DNS requests (they are transparently handled by my LAN DNS).

The real annoying change is the transition to DNS over HTTPS. The canary domain[1] is useful but apps are obviously free to ignore it.

[1]: https://support.mozilla.org/en-US/kb/canary-domain-use-appli...

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