Adding Reverse Dns

Adding reverse dns on a DC's resolvers need much care and attention you should ensure that you are going through the right path always. Any error in that may cause a down time to the resolvers.
Inoredr add reverse entries please follow the steps given below

1.) Ensure that the hostname resolves to the IP that the client is requesting prior to inserting the reverse DNS record. This can be done by pinging the hostname

2.) Login to the resolver server

3.) Edit the correct file for the IP address of the reverse DNS record. For example, if a client requested "please add abc.domain.com -> 205.64.34.142" then we will need to edit the file for c-class 205.64.142.1. The command would be as follows: ee /etc/namedb/master/34.64.205.in-addr.arpa
5. You will then need to insert a reverse DNS entry like: 142 IN PTR abc.domain.com.
6. Once inserted, you need to change the serial number in the file.
7. Save the file, and exit.
8. Reload named to reflect the new changes by executing the command: /etc/rc.d/named reload