I started getting IPs from ARIN directly, instead of the data center I'm colocated at. Now I have to start applying rdns myself for my clients upon request, instead of having the NOC at the DC do this. That is obvious, since I am in full control over the IP delegation and therefore have nameserver authority.

The question is, how do I "create" ptr / rdns records for my clients?

My current server uses Cpanel / WHM with ns1/ns2.mycompany.com

I also applied those as dns nameservers in the ARIN IP's whois record.

How do I create rdns for my clients? Should I install Cpanel DNS Only on a entirely separate server and use this method instead?

http://layer1.cpanel.net/

If so, how can I seamlessly transition over the dns records to that new dns server, retaining my ns1/ns2.mycompany.com and their ns1 and ns2 IP addresses?

Even more important: I have to change the ns1/ns2 IPs to the new ones I retrieve from ARIN. How can this be done, avoiding downtime during the dns transition?

On a side note, would it be easier to just install Cpanel DNS Only on a dedicated server and just use dns1.mycompany.com and dns2.mycompany.com with their own dedicated ns1/ns2 IPs from ARIN - and utilize this dns server for customers who request rdns? Would this be a more viable solution than using our current ns1/ns2.mycompany.com Nameservers?

1. Is Cpanel DNS Only a standalone software that does not require Cpanel/WHM on another server?
2. Is it possible to have redundant dns servers setup using this software solely, ns1 on one server and ns2 on another?

Thanks.