Hi Minaezzat. Forgive me for the delay. I noticed that your default route is pointing to an address that is in the same subnet as  the NAT outside address (z.z.z.z). I find it interesting that you don't have connectivity to this address and that you ...

Thank you Minaezzat,The first thing we need to do is check for basic connectivity.  Are you able to ping the outside interface of your router from a computer outside of your network?  If so, then please check your external ip using the following webs...

Hi minaezzat, Would you mind sending me a snapshot of your topology? Specifically, are there any other networking devices between this router and the Internet? Regards, Matt