How to setup Reverse DNS

[myinternetnews at my-deja.com]

Hello,

My ISP assigned me an ip of 209.249.221.50/240.
I have successfully setup everything on my DNS except it failed when I
try to access some site that need reserve dns respond.
Can someone tell me how to setup reverse DNS? or tell me where do I
need to change.
I have the /etc/named.conf and /var/named configured.
Thank you


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