Reverse dns configuration has been done on bind dns server but still reverse lookup is not working fron outside?

Solution Verified - Updated -

Issue

  • Configured DNS server internally and necessary nat setting has been done on firewall. Still unable to resolve records configured in zone.
  • Public facing dns is configured to answer reverse dns query but it does not get resolve from outside.

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Bind (as DNS server)

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