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ip address assignment rule

Let's say I have an IP Pool of 192.168.0.100 - 192.168.0.200

I believe that the first VM instance will get the IP address "192.168.0.100" The Second instance will get the IP address "192.168.0.101" And the Third "192.168.0.102" And so on... meaning I believe the default rule is ascending.

Is it possible to make this rule descending like... 192.168.0.200 -> 192.168.0.199 -> 192.168.0.198

Is there any configuration file to control the ip assignment rule?

I'm asking this because how openstack chooses the ip address was always a mystery for me...