On Nov 22, 2013, at 2:43 PM, Otávio Augusto <otavio.augusto at gmail.com> wrote: > > It's CentOS. It was working fine a few days ago. Then I performed a git pull and this problem came up. > Anything I should consider? Yes, use the iproute package from the CentOS OpenStack Havana repo: yum install http://repos.fedorapeople.org/repos/openstack/openstack-havana/rdo-release-havana-6.noarch.rpm yum install iproute Apparently the iproute that comes with standard CentOS 6 doesn't support network namespaces. +Dan