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one more thing to know what version (liberty? Mitaka?) 

The security rules don’t get set with the new Mitaka so just make sure that you do set them, I have seen issues where the instance does not behave well and if you do set the SG make sure you have the ports open as Peter stated below. 

Remo 
> On Apr 15, 2016, at 10:14, Erdősi Péter <fazy at niif.hu> wrote:
> 
> 2016. 04. 15. 15:41 keltezéssel, Jorge Luiz Correa írta:
>> I think that in neutron-openvswi-i7a7a669c-3 should exist some RETURN rule using the 172.16.0.5 IP address.
> Just a fast thought:
> Did you assigned a security group with icmp enabled rule to your VM?
> 
> I think, thats will made your exception to avoid DROP at the end...
> 
> Regards:
> Peter
> 
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