this post was submitted on 08 Nov 2023
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I finally figured out how to virtualize my OPNsense firewall. Suck it, Roku. (lemmy.one)
submitted 10 months ago by [email protected] to c/[email protected]
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Blocked that hard-coded google dns garbage.

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[–] [email protected] 1 points 10 months ago (2 children)

That's correct. I block DoT in my firewall and block known DoH domains in piHole. I'm sure stuff slips through occasionally but the vast majority of my DNS requests are handled by piHole.

Traditional DNS over UDP/53 is insecure but I'm using ProtonVPN's DNS server over VPN externally so I'm not worried about that.

[–] [email protected] 1 points 10 months ago (1 children)

How do you block the DoH servers in the pihole? Pihole is a DNS server, devices using a third party DoH server would just bypass the pihole as they're using the IP of the DoH with no DNS lookup required. No?

To block DoH I think you need to block it at the firewall level with a list of blocked IPs for the DoH servers you want to block over 443

[–] [email protected] 1 points 10 months ago

You're probably better off blocking it at the firewall level. It would be more thorough but also more effort. In my experience, most devices/apps that use DoH call a domain name rather than an IP. If you block the domain in piHole, the app cant resolve the DoH server IP and therefore won't be able to use DoH.

[–] [email protected] 1 points 10 months ago

I see. I may try to do something similar but towards Unbound on my OPNSense router, if that's possible.