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openstack: instance cannot connect to internet


I have one confusing question here and i could not find related question on the internet.

I am trying Openstack all in one installation using Packstack. Everything is fine. I can create an instance and connect on the internet. But the peculiarity arises when i create an another instance. The other instance cannot connect or ping to the internet (say From the other instance, i can ping the host machine, the private and public IP of the virtual router, the other instance, our infrastructure DNS, gateway, etc.

you can see my network topology below:

image description

Can anyone please help me out in this case?

Thanks in advance.