Setup Reverse DNS PTR Record with Google Cloud DNS

[Sebastian Loncar]

I need to setup a reverse DNS PTR record.

Let's have an example (example.com and 1.2.3.4 are only placeholders):

mx.example.com. A 1.2.3.4
4.3.2.1.in-addr.arpa PTR mx.example.com.

"nslookup 1.2.3.4" should return:

4.3.2.1.in-addr.arpa name = mx.example.com."

With my current Hosting-provider, i can set the Reverse hostnames for every IP-Adress, that are assigned to me (in the webinterface). But i see no way todo this in google cloud DNS.

I have created two zones:

example.com. + in-addr.arpa.

example.com.:

A record, with DNS-Name "mx". Works as expected.

in-addr.arpa.:

PTR record with name "4.3.2.1", pointing to "mx.example.com."

But this does absolutly not work. It points always to 4.3.2.1.bc.googleusercontent.com.

Of course, i understand why it does not work. The "owner" of the IP (google) has to modify some settings in their own reverse-zone.

So, what can i do now, to reach my goal? (The goal is, that 4.3.2.1 is pointing back to mx.example.com. and NOT to 4.3.2.1.bc.googleusercontent.com.)

Otherwise, it's nearly unpossible to send mails via google cloud (without using gmail). Every "simple" hosting provider allows the user to set the Reverse-Entries!

[Rick Tait]

Sebastian,

have a look at this https://serverfault.com/questions/779600/how-do-i-change-reverse-dns-on-google-cloud-compute/866785#866785

-RMT

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Principal Systems Engineer, Hypermedia Systems
rick...@hypermediasystems.com | 213-915-UNIX

[Sebastian Loncar]

Hello Rick,

i researched a log time ago, the message on serverfault.com is new (this August) - but after my posting, i found that, too.

I followed the instructions exactly. But it's not successfull (yet). Here are two examples:

- phpmyadmin.gcp.tamani.de

- vpn.tamani.de

for both domains, i created a seprate reverse zone exactly as in the message described. More than 6 hours are gone now, and no update. Maybe, it's updated next day, i will check this.

(there's hope: nslookup, server=the specific google cloud dns server ( ns-cloud-e1.googledomains.com / ns-cloud-d1.googledomains.com ), query the special in-arpa-addr record returns the correct result)

Am Mittwoch, 23. August 2017 22:50:02 UTC+2 schrieb Rick Tait:

Sebastian,

have a look at this https://serverfault.com/questions/779600/how-do-i-change-reverse-dns-on-google-cloud-compute/866785#866785

-RMT

On Wed, Aug 23, 2017 at 8:37 AM, Sebastian Loncar <sebastia...@gmail.com> wrote:

I need to setup a reverse DNS PTR record.

Let's have an example (example.com and 1.2.3.4 are only placeholders):

mx.example.com. A 1.2.3.4
4.3.2.1.in-addr.arpa PTR mx.example.com.

"nslookup 1.2.3.4" should return:

4.3.2.1.in-addr.arpa name = mx.example.com."

With my current Hosting-provider, i can set the Reverse hostnames for every IP-Adress, that are assigned to me (in the webinterface). But i see no way todo this in google cloud DNS.

I have created two zones:

example.com. + in-addr.arpa.

example.com.:

A record, with DNS-Name "mx". Works as expected.

in-addr.arpa.:

PTR record with name "4.3.2.1", pointing to "mx.example.com."

But this does absolutly not work. It points always to 4.3.2.1.bc.googleusercontent.com.

Of course, i understand why it does not work. The "owner" of the IP (google) has to modify some settings in their own reverse-zone.

So, what can i do now, to reach my goal? (The goal is, that 4.3.2.1 is pointing back to mx.example.com. and NOT to 4.3.2.1.bc.googleusercontent.com.)

Otherwise, it's nearly unpossible to send mails via google cloud (without using gmail). Every "simple" hosting provider allows the user to set the Reverse-Entries!

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[djlo...@gmail.com]

Hi,

Did you ever get this working?

I tried to setup reverse DNS to my GCP VM instance static IP.
I also followed the instructions exactly, but so far this has not been effective... (even though i did it yesterday), the reverse dns is still returning a *.bc.googleusercontent.com name, rather than the domain name I added in the new zone...

Thanks,
Lewis.