Question

rDNS

  • Posted on November 16, 2013
  • iswhiteAsked by iswhite

Hello! I have 1 droplet have 3 domain. I need that for each domain was registered your rDNS. So there must be three record rDNS for each domain: 51.172.185.146.in-addr.arpa name = site1.com 51.172.185.146.in-addr.arpa name = site2.com 51.172.185.146.in-addr.arpa name = site3.com

How do I add these rDNS for each domain?

Make 3 droplets too expensive. Support DO in fact refused to solve my problem.

In the result I am unable to use mail. I.e. it does not reach the addressee, and blocked because of the error: “host mx1.example.com[999.888.777.666] said: 550 X-Host Lookup Failed: Reverse DNS lookup failed for 146.185.172.51 (failed)”

I need your help.


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Hello,

As per this comment here, you can set the Droplet’s hostname (which would update the PTR record along with it) to e.g. mail.yourdomain.com where yourdomain.com is one of the domains on that droplet, and then add an A record for mail.yourdomain.com that points to your droplet.

This way it will be a valid PTR <=> FQDN setup and it will work fine for all of the domains on that Droplet.

As a side note, I could also suggest checking this discussion here on why adding multiple PTR records is not recommended:

https://serverfault.com/questions/618700/why-multiple-ptr-records-in-dns-is-not-recommended

Regards

Kamal, not correct for your last statement. you can have as many PTR records for an IP as your heart desires. It is functionally and technically correct.

<blockquote>3. AFAIK DO only allows 1 rDNS (PTR) record per droplet/IP. If you want 3 rDNS (PTR) records, as in your example, you have to create 3 droplets. </blockquote> <br>That how it is for every provider. A single IP address cannot have more than one PTR/reverse DNS record.