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* VM의 MTU 값 변경

* Openstack Network MTU 값 변경
$ vim /etc/kolla/neutron-dhcp-agent/dnsmasq.conf

log-facility=/var/log/kolla/neutron/dnsmasq.log
### Adding ###
dhcp-option-force=option:mtu,1400 
또는
dhcp-option-force=26,1400

$ docker restart neutron_dhcp_agent

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