Re: [apnic-talk] Layers of NAT
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.
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.
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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