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  • Wow, if ISP really uses one public IP for several clients and I am just one of them, then it all makes sense! That's a brilliant answer, thanks. Commented Apr 11, 2017 at 8:44
  • Yes. By shared, I meant local users on private subnet are natting (PAT mostly) towards ISP IP and they are connecting from single IP with different ports. Port size is defined by 16 bits. Commented Apr 13, 2017 at 8:14
  • ISP use different architecture allowing tenants or subscribers to user public internet which may result in complexities. The concept is simple to solve your issue. I hope you resolve your issue. Commented Apr 13, 2017 at 8:16