Forum Discussion
Rapid changes in my Dynamic IP Address
Recently the dynamic public IP address assigned to me by T-Mobile Home Internet service started behaving differently. The IP address (reported by google when doing a google search for "what is my ip address") changes very rapidly, about once per second, sometimes even faster.
This is very strange. All the dynamic IP addresses I've had assigned in the past by other internet service providers (cable, dsl, etc.) did change over time, but the changes were only once or twice per day, not once per second.
The problem with the rapid changes is that some websites detect IP address changes and consider this a security risk. For example if I'm trying to log in to a website, I will enter my username and then enter my password, but when I click "login" button the website will take me immediately back to a blank login page. Or when I try to log in to webmail at my domain hosting provider it will post an error message saying "your IP address has changed..." and won't let me log in. Again, some websites are sensitive to the rapid IP address changes, others are not.
I did not experience these problems when I first started using T-Mobile Home Internet service (early part of this year) on the specific websites that are currently having problems, so the rapidly changing public/dynamic IP address seems to be a recent issue.
Since my public dynamic IP address is assigned by the T-Mobile system, that's where the problem exists. It is not a problem with my computers, home network, etc.
I made a screen capture video showing the rapidly changing IP addresses - I hope the T-mobile engineers (I have a support ticket submitted) can view this video to help understand what's going on. Anyone can view the video, here's the link:
Demonstration of Rapidly Changing Public IP Address
Yep, this is a mess, I do not think it is intentional, rather a misconfiguration of NAT64 device, or faulty firmware for said device that has been rolled out to Minneapolis region first. Again, your IP address is NOT really changing.. However at the NAT device within T-mobiles Minneapolis core, a new source IP address is being utilized for the NAT translation for every new outbound connection. Another possible reason would be that they have deployed a set of NAT64 devices behind a load balancer, and your traffic is being "load balanced" to a different NAT64 device with each new connection. In any case, traffic from your real IP address, if it needs to be NAT'ed, but be NAT'ed to the same outbound side source address for every new connection, otherwise it breaks a great many sites on the internet and renders the internet gateway unusable.
It is easy to confirm that NAT is taking place, by using your t-mobile phone hotspot, and look at the the IP addresses that have been assigned by DHCP to your phone. (The internet gateway does not appear to let you see this information). Go to any of a number of hosts that display your IP and note that the IP address the site reports, is not the IP address assigned to your phone. Go to a different site that reports your IP address, note that it is different, and also note that your phone's IP address has not changed.
Mike
Ran into all these issues. Downloaded/subscribed to NordVPN, problem solved, just need to launch VPN before logging into cPanel, Cisco secure email etc
FYI, today, at least, the issue appears to be resolved.
Mike
Spoke too soon, but it is working more often now.
Now appears to be resolved.
