IP Technical question

[Richard Clayton]

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In article <alpine.LFD.2.00.0901271902180.8689@localhost.localdomain>,
Paul Jakma <paul@jakma.org> writes

>On Tue, 27 Jan 2009, Paul Barnfather wrote:
>
>> How reliable is the mapping of subscriber account to the point of
>> physical access?
>
>That's answered in some detail in the self-same TR Richard gave a 
>link to - particularly under "Traceability of ADSL" :)

Indeed so! I learn about it and wrote it up because this traceability
problem actually occurred in a real case, and meant that the police
failed to lay their hands on someone :(

Besides the RADIUS information that Clive referred to, which postdates
my anecdote, it has been firmly suggested to me that the BT systems now
keep their own logs of the mapping between IP address and an identifier
for the physical piece of copper.  Whether this is correct, and whether
LLU providers keep the same information on the equivalent systems, I
could not say....

This isn't entirely off our usual topics -- since if an ISP concluded
that BT was holding the IP/line mapping data, then it would be excused
from Data Retention requirements for that data (since it is held by
another).  Equally, police officers who wished to obtain that
information could approach BT rather than the ISP...

- -- 
richard                                              Richard Clayton

They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety.         Benjamin Franklin

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