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I cant ping/ssh instance from VM

I have setup a clean Ubuntu 14.04 and openstack icehouse using devstack script. I create 3 instances and accessed their console. But when i tried ping these instances, i got "destination host unreachable" error for one of them. Then, in this instance's console, i used "ifconfig" command and i saw it's inet address is 192.168.177.138 but in openstack dashboard interface it's ip address is 10.0.0.3. Other 2 instances' ip and inet addresses are same and i can ping them but this instance's inet address is different. I want to ask what the reason is and how can i solve this problem ?

And i want to ask a second question. One of my pingable instances had different ip and inet address before, then i softrebooted this instance and i try ifconfig command in it's console, i saw it's inet address is same with ip address. And now i can ping it. i softreboot third instance also but it's not pingable. It's ip and inet address are still different.

I'm sharing some pictures.

My instances in openstack dashboard http://hizliresim.com/XD8NED

My pingable instance named Ankara. (it's ip and inet addresses are same) http://hizliresim.com/Q48Npg

My instance Izmir which has different addresses. http://hizliresim.com/bgZpLj

Have you any suggestions ? Thanks for your help.