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When I look at the TTL (Time to Live) for PTR records (Reverse Lookup Zone) on one of our Windows 2003 DNS servers I see some are at 15 minutes, others are at 20. They have "Delete this record when it becomes stale" checked.

  • These PTR records are for workstations that get IPs from Windows DHCP, so I think that creates the PTR records dynamically?
  • How is TTL for these records set?
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Workstations (Windows 2000, XP, and above) in a domain will register themselves in DNS. They will create an A record and a PTR record. A DHCP server can also be configured to created records on the behalf of older clients.

You can control the behavior including the TTL via group policy.

See:

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