>From my experience working for a very large (5 M households) cable ISP.
Localised traffic is possible, but only in theory.
- Each customer has a 'modem' box which offers them a public IP address,
provisioned by the ISP.
- They have also got (the option of) VOIP and IPTV, these are connected
to our internal (private) network where the communication/content is
- They cannot "see" each other. Inter-client access is only possible via
the management port, which is inaccessible downstream (client-side) of
the 'modem'. Only known modem MAC addresses are allowed to pass through.
>From the ISP side it is possible to access 'neighbours' who are on the
same subnet through each others modems. The customers cannot do this
(unless they gain physical access to the switch centres..but that's a
whole other story).
- P2P transport only uses the public IP, and so it will never be local.
At most it may have a shorter 'distance' to travel due to sharing
switches, routers and dns servers.
- Most connections are fibre-to-street, and a few thousand are even
fibre-to-home. Needless to say in these cases P2P multicast bears little
interest to an ISP. (Control of individual access is far more
interesting from the commercial point of view).
>> To clarify: I mean that if you were to look at cable ISPs, who allow
> customers to see each other, that I bet there's a /lot/ of localised
> file-sharing going on, even if just through windows file-sharing.
>> That's speculation on my part, I've never seen such a cable network.
> But all other shared networks I've seen (college, work), that's what
> happens - I suspect cable wouldn't be much different.
>> If your an op of a DSL ISP, you'd see <1% though - fully agreed. ;)
> Paul Jakma paul at clubi.iepaul at jakma.org Key ID: 64A2FF6A
> Running Windows on a Pentium is like having a brand new Porsche but only
> be able to drive backwards with the handbrake on.
> (Unknown source)
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