RT2600ac Please explain. Why this subnet?

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RT2600ac Please explain. Why this subnet?

409
71
NAS
DS 718+, 2x-DS 720+
Router
  1. RT2600ac
Operating system
  1. Windows
Mobile operating system
  1. iOS
Here’s specific on router settings.
6D7D7DA1-0202-4A62-8B10-CFEEB6CE95C1.jpeg

Now my ISP Uses GSNAT I hear, and it indicates gateway feeding me is 100.72.128.1.
Am I correct that the subnet above is necessairy so the 100.72.186.158 IP Can connect to the server at 100.72.128.1?

Thanks
 
6
1
NAS
DS920+
Operating system
  1. Linux
  2. macOS
  3. Windows
Mobile operating system
  1. iOS
IPv4 addresses are almost exhausted so most ISPs are using NAT (Carrier Grade NAT, CGNAT, Google it). If you want to access services behind your router you must ask your ISP to remove you from the CGNAT and assign a real public IP.
 
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409
71
NAS
DS 718+, 2x-DS 720+
Router
  1. RT2600ac
Operating system
  1. Windows
Mobile operating system
  1. iOS
CGNAT. MYBAD.
My issue with ISP is to have it work at all (keeps degrading) When it does work I have no trouble with QuickConnect.
Thanks for education!
 
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