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Ruisu
Asked: 2011-10-15 10:31:20 +0800 CST

Why is DNS updating every hour on the hour?

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I have a Server with a statically set IP address of 10.200.0.30

It has a Dynamic DNS entry matching its computer name to its IP

Every hour on the hour it changes its DNS entry to a random IP address in my 10.54.0.0 subnet.

What in the world is going on here? The IP is statically set on the NIC. DNS just feels like changing its entry ever hour.

When I checked the timestamp I also noticed that just about all my DNS entries are updated every hour.

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My DHCP lease time is set to 6 hours for both the 10.200 zone and 10.54 zone.

The 10.200 zone has all IP addresses excluded from the range. Reservations only.

Any help would be greatly appreciated. Thanks!

domain-name-system internal-dns dhcp dhcp-server

2 Answers

  1. According to your other question you have a DHCP server running. So someone has set the lease time to one hour.

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  2. Best Answer

    DNS A records register\refresh updates are stamped ROUNDED DOWN to the nearest hour - you're seeing normal behaviour

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