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If the client has an existing host record and changes the IP of the host record this is also considered an “Update” and the timestamp is set.If the client has an existing host record with the same IP address then this is considered a “Refresh” and the timestamp may or may not get changed depending on zone settings. The third way to set scavenging on records is by using with the /ageallrecords switch.The second is when a record gets created by a client machine registering using dynamic DNS.Windows clients will attempt to dynamically update DNS every 24 hours. When a record is first created by a client that has no existing record it is considered an “Update” and the timestamp is set.After I changed the DNS settings of the domain to point to my virtual server, I opened my cmd and typed "ipconfig /flushdns" like I did several times before to get the new IP. It won't go back to the authoritative name servers for and see if there is a new IP address until that time expires - in about 3.7 hours. It is not your cache that is the problem, it is an inherent part of the way DNS works.

If you actually run this command against a zone it will truly set scavenging and a timestamp on all records in the zone including static records that you never want to be scavenged. The timestamp may get updated on the server where the client dynamically registers but it will not replicate around to the other servers in the zone.

Since new record timestamps are not replicated while zone scavenging is disabled this also gives replication time to get things in order.

The next safety valves are the Refresh and No-refresh intervals.

Since “clean up” really means “delete stuff” a good understanding of what you are doing and a healthy respect for “delete stuff” will keep you out of the hot grease. Note: It must be set in all three places or nothing happens.

Because deletion is involved there are quite a few safety valves built into scavenging that take a long time to pop. To see the scavenging setting on a record hit View | Advanced in the DNS MMC then bring up properties on a record.

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DNS Scavenging is a great answer to a problem that has been nagging everyone since RFC 2136 came out way back in 1997.

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