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non-openstack servers in the IP range used by openstack instances

Hello,

If one is required to have non-openstack servers living in the same IP subnet as the openstack instances, as far as I can see there are two options:

  1. allocate only a slice of that subnet for instances (for example, if my subnet is 192.168.150.0/24, allocate only 192.168.150.128/26 when issuing "nova network-create" and make sure non-openstack servers use IPs outside that range)

  2. allocate it all and reserve some if the IPs for non-openstack servers using "nova fixed-ip-reserve".

Could someone please let me know what is the recommended approach?

Thanks!