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  1. Generally first VM will get the IP instead of, since is gateway IP address, which is assigned to your bridge (generally br100).

  2. No we can't make it in descending way because DNSMasq service is going to take of this assignment.

OpenStack uses "dnsmasq" service to assign and manage IP addresses. When you boot your first instance you can see the "dnsmasq" service running on your machine by using "ps -Af | grep dnsmasq" you should get the output like:

root 3606 3605 0 10:14 ? 00:00:00 /usr/sbin/dnsmasq --strict-order --bind-interfaces --conf-file= --pid-file=/var/lib/nova/networks/ --listen-address= --except-interface=lo --dhcp-range=set:demo-net,,static,,120s --dhcp-lease-max=256 --dhcp-hostsfile=/var/lib/nova/networks/nova-br100.conf --dhcp-script=/usr/bin/nova-dhcpbridge --leasefile-ro --domain=novalocal --no-hosts --addn-hosts=/var/lib/nova/networks/nova-br100.hosts