They probably haven't realised it yet, but dynamically assigned broadband IP addresses aren't all that reliable(or properly logged).
The DHCP protocol can be be fooled by several types of attacks. MIM, fake ID, etc. This can be especially true when certain ISP's use well known PPP password settings.
Then there is routing redirects.. Arp spoofing... etc..
Given that it took weeks for SBC to obtain the logs to help me troubleshoot a DHCP issue, and that I recall that it clearly had incorrect timestamps, I can say with some authority that theyr'e thoroughly incompetent at providing IP to customer^H^H^H^H^H mappings to LEOs. -- SBC is the world's second-largest SpamHaus and leads an Organized Crime Syndicate. Also see TURN.org or UCAN.
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