Hey Manuel, Did you tried creating a new network after modifying the .conf files and checking if VMs on that network had the correct MTU? Also, kolla-ansible supports custom service configurations: https://github.com/openstack/kolla-ansible/blob/master/doc/source/admin/advanced-configuration.rst#openstack-service-configuration-in-kolla -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack/attachments/20171123/2517b5fd/attachment.html>