Re: IPv4 flag day

[Vincent Bernat via NANOG <nanog () lists nanog org>]

On 2026-06-18 09:44, jordi.palet--- via NANOG wrote:

> Very nice blog article. Only a note that in the case of 464XLAT, the stateless NAT46  only happens if there is no DNS64 
> (in the host - self-synthesis - or in the network), so mainly only when using literals (for example ping 8.8.8.8 
> instead of ping dns.google.com). So in practice, this tends to be much less than 1% of the traffic. Instead in MAP-T it 
> is 100% of the traffic.

Thanks! I'll update the schema with that. But this stateless translation 
on the device is mostly free. My understanding is that 464XLAT is 
popular for its flexibility (per customer allocation is possible), but 
has a cost because PLAT is stateful, while MAP-E/MAP-T is 
one-size-fits-all (but you could have a few different subnets), but as 
PLAT is stateless, this is very cheap to implement (we do that on 
devices that cost almost nothing).
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