Enabling DoH in Firefox disables OpenDNS filtering

[bricolas]

On my PC, after enabling DoH (settings > search for "DoH" > "Activate DNS via HTTPS" (Cloudflare).

https://blog.nightly.mozilla.org/2018/06/01/improving-dns-privacy-in-firefox/

On Chrome, the websites are blocked as previously but on the same PC, Firefox doesn't block.

[rotblitz]

OpenDNS does not support DoH but DNSCrypt. Therefore you must keep DoH disabled in FireFox, else you will be using CloudFlare DNS, not OpenDNS.

[bricolas]

That means that, as client user, you can "disable" the OpenDNS filtering on a network, by using Firefox and DoH ?

[rotblitz]

Yes, sure, you can circumvent OpenDNS by not using it with this and many more methods you may not even be aware of. You must take additional measures, of course. See for example https://support.opendns.com/hc/en-us/articles/227988027

OpenDNS provides the service you expect, but only if and when you send your DNS queries to them.  If you send them to somewhere else, e.g. to CloudFlare, then you take OpenDNS out of scope.  They have no way to provide the service then, of course.

[bricolas]

Thank you rotblitz that's good to know !

Best regards,

Nicolas

[bricolas]

With Synology, there exists an easy solution :

DNS over HTTPS: things to consider when you go “private”

I just received this article.

[rotblitz]

What easy solution? Definitely not for using OpenDNS. Again, OpenDNS does not support DoH.