I have been reading a bit about Carrier Grade NAT and the ability to use the same IP for multiple customers. I have seen many small WISPS using this presumably to save money on buying IP blocks. The vast majority seem to use a radius system and I would suspect that the IP recorded would be the same for all the users sharing the IP at that time. As I understand it is important to keep strict records of IP usage in the event that law enforcement requires this information. If this information was required though how would it be possible to determine the user?
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