> The issue (which was very annoying to track down) is the nova_ipam_lib is loaded by default, and it trickily was unsetting the timeout_fixed_ips setting of FlatDHCPManager with the (seemingly innocuous): > self.net_manager.timeout_fixed_ips = not self.net_manager.DHCP Got it. I can confirm that it has fixed our problem with addresses not being released. Thanks! -- Lars Kellogg-Stedman <lars at seas.harvard.edu> | Senior Technologist | http://ac.seas.harvard.edu/ Academic Computing | http://code.seas.harvard.edu/ Harvard School of Engineering and Applied Sciences |