On 06.11.2025 12:13 Vasilenko Eduard via NANOG <[email protected]>
wrote:

> Nope. It is an extremally complex bunch of protocols on the 1st hope
> (between the computer and the router).
> 
> If it was be like you said - IPv4 would be down already.

It already is in certain networks.

Various ISPs do DS-Lite - no IPv4 to the customer - IPv6 with tunneled
IPv4 if needed.
Cellular ISPs only give IPv6 with NAT64 or CLAT.

-- 
kind regards
Marco

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