Joe,

>> IPv4 fragments do have a higher drop probability than other packets. Just 
>> from the fact that multiple end-users are sharing a 16 bit identifier space.
> 
> It’s really the fact that NATs that process fragments don’t reassemble before 
> translating and/or don’t rate limit fragments they generate as already 
> required by 791 (as explained in 6884).

That’s incorrect.
See https://tools.ietf.org/html/rfc7597#section-8.3.3

> A NAT that is broken isn’t helping users share addresses. It’s just broken.

I wish it was that simple.

Cheers,
Ole

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