The main sectors in which I've see this done is in the wireless mobile space, as well as to some degree within fixed broadband networks within a significant Northern Asia market as well as a couple of smaller Southeast Asian markets.
On Nov 15, 2010, at 5:50 PM, Lindqvist Kurt Erik wrote:
> Maybe I am mistaken but I am under the impression that in many networks/countries in Asia, IP connectivity for DSL customers are done using multiple layers of NAT.
Typically, the same RFC1918 space is used over and over again within the CPE/access layer, and then other RFC1918 space is used at the distribution layer. There's also a fair amount of what amounts to internalized route hijacking/misassignment of valid CIDR blocks which are deemed irrelevant or in fact undesirable by some parties, so misusing them for this purpose is seen as inconsequential, if not a positive good in its own right.
There's also a lot of 'transparent' proxying/filtering/redirection and other tomfoolery which takes place, as well, of course.
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