Re: [v6ops] Our IPv6-only home network and future experiments

[Brian Candler <[e-mail]>]

On 15/04/2024 08:03, Vasilenko Eduard wrote:
> The initiative looks strange for me.
> It has an assumption that some*old*  application insists to use IPv4 and this application*could not be changed*  to use IPv6 properly.

No, that's not at all what the underlying driver of this is.

Rather, the issue is what happens when a modern, well-written dual-stack 
application is running on an IPv6-only network, but needs to access an 
IPv4-only resource on the Internet.

The proposed approach allows the application to do DNS lookups, find 
only an A record, open an IPv4 socket and make a connection (as it would 
do on a dual stack network) - but this is transparently rewritten to an 
IPv6 connection to a PLAT with the IPv4 address embedded in the 
destination IPv6 address - i.e. 464XLAT.

This approach is cleaner than DNS64, where you pretend that every 
IPv4-only resource has a AAAA record that points to your local PLAT. It 
also means that an application can make a connection to an IPv4 literal 
address (e.g. 1.1.1.1) and it works.