we cannot assume that the connection between isp and cpe is a single entity. 

a typical example will be the guy who run the dslam and the guy who run the 
bras belong to two different companies in market which mandate open access.

Alex Rubenstein <a...@corp.nac.net> wrote:

>> >> Not necessarily. When the CPE is configured through DHCP (or PPP?),
>> >> the ISP can send the secret.
>> >
>> > Which can be seen, in many cases, by other parties
>> 
>> Who can see the packets sent from the local ISP to the CPE directly
>> connected to the ISP?
>
>The NSA, FBI, CIA, DHS. Or, the ISP, the ISP's employees, contractors, 
>sub-contractors. Or the phone company handling the PPPOE, L2TP, or whatever 
>else. Or the WiFi sniffer on the street outside.
>
>
>
>

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