this post was submitted on 10 Jul 2023
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Mobile will often switch ip's on tower handoffs. If you're driving down the road or on a train, it's nothing to change mobile ip addresses every 2 minutes.
Not in my experience. But OK, if this is the case, don't use exact IPv4 address, lookup the routing database and use the sub-net. Or whatever. This is belt & suspenders style of defense in depth, just another layer of security if all others fail. Not core functionality.
I work for a mobile game company. Millions of clients. We deal with this a lot. You can't even predict that they'll stay in the same class A. I wouldn't be surprised if they worked out a way to hand off ipv4 to 6 and vice-versa.
Then you have ISP's and large work networks who send everyone out under the same NAT/PAT, 10's of thousands of users all coming from one address.
IMO Providing a public service then trying to identify individuals by network without screwing someone over is a fools errand.
If you're dipping logs and see one jackass doing something on x IP, you always have to go back and see how many ip's that jackass is coming from and also how much viable traffic is coming from that ip.