Hi All,
      I found the problem, it was mistake, I forgot totally the DHCP agent requires an IP,
now I am using a bigger pool, I can assign a floating IP, the router public interface is
up.
      Unfortunately I cannot reach the instance, and of course I cannot login from the
console to see what is in the instance because I do not have the default cloud-user
password.
      Can someone guide me how to solve it?
      For neutron and nova checks: 
http://pastebin.com/sxndErDC
      For troubleshooting to reach the instance: 
http://pastebin.com/KTtQ2DFw
      IFCFG for external interface on Controller (network node):
http://pastebin.com/10MRZiM9 
      IFCFG for external bridge on Controller (network node): 
http://pastebin.com/RsXb7wXH
      IFCFG for internal interface on Controller (network node):
http://pastebin.com/jRKRSnc7 
      IFCFG for internal bridge on Controller (network node): 
http://pastebin.com/sdNnsi85
      Output of ovs-vsctl show: 
http://pastebin.com/agy1FxDx 
 
      Can someone guide me how to solve the problem?