Re: IPv4 flag day

Tom Beecher via NANOG wrote on 22/06/2026 13:28:
> Nor should they. Stop trying to over-engineer solutions. Not everything
> needs hyper performant connectivity with sub second failover.

no-one is going to get bgp based provider resilience with sub-second 
failover. 60-90 seconds would be a more realistic expectation for global 
convergence due to lots of providers having slow control planes / high 
churn and non-zero mrai. That's quite apart from the technical 
complication of bgp. And the general cost to other peoples' FIBs and 
control planes.

NAT can be tuned far faster than BGP could ever successfully fail over, 
at the expense of session termination and the very minor nuisance of 
header address translation. It would be silly for most organisations to 
do anything other than some NAT variant.

This is independent of address family.

Nick
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