[v6ops] NAPT-based multihoming [draft-ietf-v6ops-multihoming-without-nat66 WGLC]

[Brian E Carpenter <[e-mail]>]

On 2011-02-28 21:01, Randy Bush wrote:
...
> 
>    In IPv4 a common solution to the multihoming problem is to employ
>    NAPT on a border router and use private address space for individual
>    host addressing.
> 
> common?  more like extremely rare and somewhat kinky.

Huh? Having a different NAPT at each egress is a common technique
in large entreprise networks, so that each egress is PA-addressed as
far as the ISP is concerned. Then internally the enterprise network
uses whatever prefix it wants, either IANA-allocated or RFC 1918.

Of course, externally visible servers have to be in a DMZ that isn't
NATted, but that is a tiny minority of the hosts in such an enterprise.

The ISPs don't know this is happening, just as my ISP at home doesn't
know that I have a consumer NAT.

NPTv6 does exactly this.

   Brian