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Are you running GRE system with MTU 1500 at VM's eth0 ? Then run ifconfig eth0 mtu 1454 up.

Are you running GRE system with MTU 1500 at VM's eth0 ?
Then run ifconfig eth0 mtu 1454 up.

up.
Are you running GRE system with MTU 1500 at VM's eth0 ?
Then run ifconfig eth0 mtu 1454 up.

System tuning

[root@dfw02 neutron(keystone_admin)]$ cat dhcp_agent.ini | grep -v ^# | grep -v ^$
[DEFAULT]
interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver
handle_internal_only_routers = TRUE
external_network_bridge = br-ex
ovs_use_veth = True
use_namespaces = True
dnsmasq_config_file = /etc/neutron/dnsmasq.conf

[root@dfw02 neutron(keystone_admin)]$ cat  dnsmasq.conf
log-facility = /var/log/neutron/dnsmasq.log
log-dhcp
dhcp-option=26,1454