> >
> > My understanding was that the traffic is not charged to the IP but to
> > the physical line and that line happens to have a static IP. There is
> > only
> > a subtle difference but it means that it does not matter who the Internet
> > user is, or if they have ever connected to the internet using that ADSL
> > line or not. It only matters what IP is assigned to that physical line
> > and
> > who rents that physical line.
> >
> > In theory I think that it is possible to get gigs of data on a line before
> > any one connects to it. If the IP gets a DoS attack just after the line
> > is installed then the line renter would pay for that data.
>
> This is not the case as the route updates would tear down the ip route for
> that node as the user dropped offline and the static ip would return to
> the vast world of null until such time as the user logged in again.
>
> the static IP is not tied to the physical line it is tied to the
> username/password that is stored in the ISP database and passed back via
> radius attributes when a user comes online by utalising a
> Framed-IP-Address attribute.
>
> as opposed to a dynamic IP where no IP is passed back via radius and so
> the user gets one allocated from a pool that is associated with that NAS.
> (the ISP may also be doing a pseduo dynamic IP but thats another story
> again and works in a similar way to static IP's from Telecoms perspective
> - just happens all customers have one)
>
> This allows one with a static IP to roam to the other end of the country
> and login with their username/password and have the static IP follow them.
>
> The most that would happen is that the ISP has a static route in place
> pointint to their Telecom CAR for your IP and when you drop offline the
> packets his the CAR and then drop into the big /dev/null void.
>
> Dynamic routing is fun !.

This is all good.

It does not explain the comment someone made that they disconnected in
the middle of a DoS attack and saw their usage increase.

Chrissy.

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