[Info-vax] implementing IPv6 on the internet

[Dirk Munk]

Chris wrote:
> On 09/23/16 22:12, Dirk Munk wrote:
>
>> Great, and how does the router know the IPv6 address of Microsoft, or
>> even better, how does the router know it has to send the packet to the
>> IPv6 address of Microsoft?
>
> The router doesn't have to ask those questions, as it already knows
> that it is on a v6 network on the WAN side, having a V6 address from
> the isp. Assuming the above, the router will always use v6 for it's
> dns request to the isp. The problem I can see with this is that
> translating to the local V4 subnet, it may have to use a dummy v4 dns
> value in it's reply to the subnet node, perhaps by stripping off some
> of the bits, or a hash function, but so long as the router keeps track
> of that, it will work, much as tcp connections are tracked through
> state tables.
>
>> The PC did a nslookup remember, the router didn't. The router doesn't
>> know it has to exchange the IPv4 address of microsoft by the IPv6
>> address, how could it? If the PC sends something to an IPv4 address, how
>> can the router know if this destination also has an IPv6 address?
>
> The pc doesn't care. It makes a dns request via the *router* and uses
> whatever its given in reply. The fact that that it may or may not be a
> genuine address for Google whatever, doesn't matter, so long as there
> is agreement in translation terms.
>
> Heck, i'm not designing this stuff, but doesn't look too arduous to
> me. There again, if you can only think of stuff to stop it working,
> you would never start anything, right ?...
>
> Regards,
>
> Chris

Great, you just designed a completely new way of how a NAT router is 
functioning. A kind of master - slave relationship with the devices on 
its LAN, instead of simply exchanging IP addresses and ports in passing 
data streams.

Anything can be designed in IP land, even the most ludicrous protocols.

You can write this proposal down in an RFC, and submit it. Don't forget 
to explain why you want it. Then discuss the whole matter for five years 
or so, and see if you can find anyone who is willing to build devices 
like that.