Comment 1 for bug 1301958

I stumbled upon the same problem.
I was following the installation manual at http://docs.openstack.org/icehouse/install-guide/install/apt/content/index.html for my own testing purposes and everything went smoothly (only with a few small hiccups). The biggest problem I faced was with logging into instance spawned from cirros image and the culprit was with MTU of the instance's interface. After some googling I set the dhcp-agent to send mtu option, but cirros udhcpc's default script doesn't handle it at all.