neutron server ml2_conf.ini

[ml2]
type_drivers = gre
tenant_network_types = gre
mechanism_drivers = openvswitch
mechanism_driver = openvswitch
[ml2_type_flat]
[ml2_type_gre]
tunnel_id_ranges = 1:1000
[ml2_type_vxlan]
[ovs]
tenant_network_type = gre
local_ip = 172.16.253.254
enable_tunneling = True
tunnel_types = gre
tunnel_id_ranges = 1:1000
integration_bridge = br-int
tunnel_bridge = br-tun
[securitygroup]
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
enable_security_group = True
[agent]
tunnel_types = gre
root_helper = sudo /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf