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why i could not ping my vm with floating IP when i hard reboot my vm

i just deploy the openstack system in my ubuntu 12.04. VM could get floating Ip and i could access the vm with it. but i found when i hard reboot the vm with the dashboard, i could not ping the VM with floating IP successfully. i try to ping the virtual router which vm connected and could ping successfully.
But after i update my security group's rules( add a rule or del a rule), i could ping the vm successfully again.

is there anyone met this problem? how could i solve this strange problem?