>I think the third scenario is likely to be problematic.
>
>My understanding is that your third scenario would
>require that the customers' networks all be part of
>the same site as the ISP network - at least as far in
>as a DNS server somewhere. I imagine some ISPs
>might want to draw a site boundary somewhere
>between the ISP edge and the CPE; either in the
>CPE or in the ISP edge device or by declaring the
>CPE-PE link to be not in either site...
if CPE can become dual-sited (participate into ISP's site and
customer's site) it can relay DNS query requests/responses between
clients in customer's site to DNS server in the ISP.
itojun
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