[arin-ppml] IPv6 Heretic thoughts

Cliff Bedore cliffb at cjbsys.bdb.com
Sat Sep 6 16:11:18 EDT 2008

Sam Norris wrote:
>> As defined in the original email and above, it is the conversion box (or
>> translator) that does the one-to one mapping of IPv6 to IPv4.
> Thats funny.  How do you plan on mapping 128 bits to 32 bits ?  When 
> you say 'one to one' mapping, that is NAT, and no, there aren't enough 
> addresses to map to every ipv6 address.
I don't.  I map the 32 bits of IPv4 into various 64 bit subnets of IPv6 
around the IPv6 only Internet backbone.  Each current IPv4 user gets 
assigned at least one IPv6 64 bit subnet.  Whatever sized IPv4 they have 
gets mapped to a small section of that 64 bit subnet and the conversion 
box translates the IPv4 from the outside one-to-one to an IPv6 address 
on the IPv6 backbone.  There is no more IPv4 except behind the 
conversion box and the Internet looks like IPv6 only to everyone 
"inside" the net. No tunnels. No NAT (unless someone wants part of the 
IPv4 space "protected" by NAT)


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