Consider the following simplified scenario.
- A DHCP scope has its lease duration set to the default 8 days.
- The DHCP scope is low on available IP addresses.
- Client-A has NOT renewed its IP address lease in 8 days, so it has expired.
- Client-B is requesting a new IP address.
- The DHCP server assigns Client-B the address that was leased to Client-A.
So far so good. This is a very typical scenario and everything works as we would expect. Now let’s add DNS into this story.
- An Active Directory integrated DNS zone is set to scavenge stale resource records.
- The defaults are used; “No Refresh = 7 days” and “Refresh = 7 days”.
- The server defaults are used as well; “Scavenging Period = 7 days”.
- Client-A renewed its DNS record 8 days ago (the last time its DHCP lease was updated as well).
- Client-A is the owner of its DNS record […]