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In conclusion: Magic DNS (tesseract.dubvee.org)
submitted 9 months ago by to c/programmer_humor@programming.dev
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[–] 2 points 9 months ago (3 children)

but I don't run a recursive resolver, I use quad9 as upstream. Shouldn't they return a response even if I was blocked?

dig confirms with EDNS extensions that the response is coming from quad9. the error says "no reachable authority" so it must be at least partly what you say, but I think you ended up blocking a DNS provider.

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  • [–] [S] 3 points 9 months ago* (last edited 9 months ago)

    Ugh. Thanks. It's quite possible, though maybe just a regional one? I did inadvertently block one of the IPs Let's Encrypt uses for secondary validation, so this may be another case of that.

    I get a shitload of bad traffic from the southeast Asia area (mostly Philippines/Singapore AWS) and have taken to blanket blocking their whole routes rather than constantly playing whack-a-mole. Fail2ban only goes so far for case-by-case.

    Here's the image from the meme from an alternate source:

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