Flush DNS cache in Linux

If you register a new domain name and you can’t access it, it may be your DNS cache that holds the problem. You can flush DNS cache in Linux:
#/etc/rc.d/init.d/nscd restart

Understanding DNS Lookups

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Reverse DNS on cPanel

Configuring Reverse DNS in WHM

Reverse DNS uses pointer records (PTR) to convert IP addresses into domain names. This is the opposite of forward DNS, which uses A records to convert domain names into IP addresses.
- Adding the Reverse DNS Zone File
- Editing the Reverse DNS Zone File
- Testing Your Records