I’m working in an ISP as an a network administrator. We use CGNAT to provide internet services to our customers. ~250 users are NAT-ed to one global IP address. Recently some of our customers started complaining about some Android/IOS apps that were not working properly. But when they change the network to cellular network it works like a charm.
I started investigating the problem. The routing part was OK. Those apps also had Web pages. When I tried opening those pages from the laptop of the complaining customer I immediately noticed the problem. The page asked mo to complete the CAPTCHA. I’m pretty much sure that that’s the very same reason of why the mobile devices could not work.
I tried to contact those companies for whitelisting our IP addresses but without luck. What can I do about it as an ISP worker? As you may already know I (and I guess the rest of the world too) don’t have any choice other that deploying NAT at the moment. And NAT provides us with such problems. Any help is appreciated!