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rDNS, how? (feddit.dk)

submitted 1 year ago by drkt@feddit.dk to c/selfhosted@lemmy.world

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I'm on at least 2 blocklists at this point for the crime of not having reverse DNS set up. I don't know how rDNS works. No amount of reading Wikipedia is helping me understand what I have to do.

I have a domain at a registrar which gives me bog standard DNS.
I have Apache running on my network.
I have PiHole running on my network.

My understanding is that rDNS is not set up at my registrar, but somewhere in my network. What do I do?

Thank you for your time.

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[–] earthling@kbin.social 4 points 1 year ago (25 children)

Can you expand on how you got blocked? First time I’ve heard of this.

[–] drkt@feddit.dk 2 points 1 year ago (24 children)

I would love to tell you why they do this, but I can't. I can only tell you that they tell me it's because I don't have rDNS

These guys are blocking me http://www.uceprotect.net/en/rblcheck.php "Level 1 HIGH DNS problem WARNING: No Reverse-DNS (PTR) is assigned to your IP"

These guys are blocking a friend of mine who has the same setup as me https://matrix.spfbl.net " No rDNS was found. This IP has been flagged because have none valid FCrDNS. Register a valid rDNS for this IP, which points to the same IP. The rDNS must be registered under your own domain for you be able to delist it."

[–] MDKAOD@lemmy.ml 2 points 1 year ago

Depending on your isp, you may be required to have a business class plan with a static ip. I went through something similar years ago for my business. This is old documentation for Verizon, but it's a hint.

https://community.verizon.com/t5/Fios-Internet-and-High-Speed/How-to-make-reverse-DNS-point-to-my-own-domain/td-p/1376002

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