[Rdo-list] Problems with Openstack installation on CentOS 7

Hi everyone, I recently installed Openstack with RDO packstack on two servers. on each server I have 2 interfaces eth0 and eth1 each one of this interfaces is on a seperate vlans. As the VMs spawened by NOVA couldn't get an IP address, I saw in a tutorial that I should edit the files ifcfg-br-ex and ifcfg-br-int and when I did I lost my connection and couldn't anymore ssh to my servers. Do you have any idea how i can solve this? thank you in advance, Pauline,