IP Technical question

[Richard Clayton]

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In article <2laffisapFgJFAaT@perry.co.uk>, Roland Perry <lists@internetp
olicyagency.com> writes

>Where is the throttling being done - something is turning a gigabyte 
>backhaul at the ISP side of the DSLAM into numerous 0.5/1/2/4MB etc 
>tails. I had envisaged perhaps a fairly hard setting in the DSLAM, or is 
>it done very "softly" somewhere else [1]?

For cable modems (DOCSIS), the setting is held inside the CPE, which
fetches a configuration file using TFTP. The hardware device is
generally owned by the cable company, so it would be "hacking" (and
unlawful) to change it...

>[1] Even as a secret setting pushed from my ISP, inside my router - in 
>which case, why don't we hear about people hacking it.

... and yes, there is an ongoing war being fought by the cable companies
over whether or not changes (so called "uncapping") can be made. For a
brief account of this (up to 2005 anyway, by which time the bad guys
were cloning the entire device) see my thesis (op cit) #3.2.3 :)

- -- 
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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