Set up rDNS of PTR zone
Add this lines into the named config file
Because the $ORIGIN reflects the reverse map domain all right-hand names must use an FQDN format (they end with a dot). If the terminating dot on joe.example.com above were omitted in error it would become joe.example.com.12.123.202.IN-ADDR.ARPA - not the desired result!.
An IP address in a reverse can be defined only once - unlike a forward-mapped zone. If multiple names are assigned to a host using CNAME RRs, A RRs or AAAA RRs then only one can appear in the reverse map. Which one you select is a matter of operational usage. Thus if a mail server (mail.example.com) and a web server (www.example.com) both have the same IP address then since mail systems frequently use reverse lookups as a trivial security check it would be sensible to define the reverse map to use mail.example.com.
It is not essential, but considered good practise, to define all assigned IPs in the reverse map.
It is sensible to define the reverse map in order of IP addresses or some other fixed order to avoid subsequent errors or to simplify searching for a particular value.
[root@~]# /etc/init.d/named restartRestart named service.
126.96.36.199.in-addr.arpa name = joe.example.com.
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