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A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

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I finally figured out how to virtualize my OPNsense firewall. Suck it, Roku. (lemmy.one)

submitted 2 years ago by AdventuringAardvark@lemmy.one to c/selfhosted@lemmy.world

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Blocked that hard-coded google dns garbage.

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[–] jubilationtcornpone@sh.itjust.works 40 points 2 years ago (9 children)

I have a firewall rule to dst-nat any outgoing DNS requests not coming from piHole back to the piHole server. That way all devices on the LAN are forced to use piHole for DNS and can't bypass it. I don't have an OPNSense firewall but I would think it should be able to do that as well.

[–] Silejonu@kbin.social 2 points 2 years ago (5 children)

I suspect DoT and DoH still go through, though? I mean you can always block the port 853 for DoT, but DoH is another story.

[–] jemikwa@lemmy.blahaj.zone 2 points 2 years ago* (last edited 2 years ago)

Yeah you'd need an L7 application layer filtering firewall to catch DoH since it would detect the SSL packet signature on port 53. Unfortunately that balloons the cost of the device past a reasonable level for a home aficionado.
A workaround for now would be to block known public servers that use DoH like Google DNS, since a lot of devices are adding features to enable DoH by default at the OS level

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