reverse dns question

Hi,

How can you tell if you have reverse dns enabled on a server running linux 7.3? If it isn't enabled. How does one go about enabling it?

One more questions. If reverse dns is enabled, will it do reverse lookups for all the nameservers on the server? Because some guy with south african domains wants hosting on my server, but they require reverse dns.

Thanks.

 

 

 

 

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