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How rDNS technically works in Digital Ocean?

Posted December 29, 2019 1.1k views
DigitalOcean Accounts

Hello,
I wanted to ask how rDNS (reverse DNS) exactly works in Digital Ocean, it’s unclear to me how simply naming my droplet to an FQDN would automatically handle the PTR record(s), what if I used an already existing or non-existing FQDN? What if I named my droplet “google.com”? What if I named it “abcxyz.org” (assuming such domain doesn’t exist)?

In other words, how is rDNS technically/internally set up for DO droplets?

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ElicWilly
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ElicWilly

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alexdo December 31, 2019

Hello, @ElicWilly

The Reverse DNS is configured automatically from our end based on the droplet’s hostname.

In case you choose a hostname which is already in use or something like google.com the hostname will simply not work for you in way to access/connect your droplet via the hostname and you will need to use the IP address in order to login via ssh or access it in the browser.

Hope this helps.

Regards,
Alex

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  • BaneTerry January 1, 2020

    What if I used a hostname that I don’t own? I believe that was a part of the OP’s question that wasn’t answered.

    Also, can you please emphasize in a more technical way what exactly happens under the hood when you mentioned:
    “In case you choose a hostname which is already in use or something like google.com the hostname will simply not work for you”
    Why -technically- in case of “Google.com” it wouldn’t work while anything else that’s valid from the owner’s and/or DO’s perspective would? How can the system tell if a given hostname is whether valid or not?

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    • alexdo August 1, 2021

      Hello,

      The idea is to use a domain that you own in order to set up everything correctly.

      You can have a PTR that does not match your domain name, but if you have the correct SPF and DKIM records your outgoing emails will be delivered just fine.

      Regards,
      Alex

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