Hi, Fred,

> On Dec 8, 2021, at 10:43 AM, Templin (US), Fred L <fred.l.temp...@boeing.com> 
> wrote:
> 
> Joe, let’s forget about 1280 for the time being but please describe a path 
> where an
> IP packet no larger than 576 (DF=0) would be dropped due to a size 
> restriction and/or
> fragmentation. What would RFC3819 have to say about such a path?

It gets dropped after it gets fragmented if the fragments encounter a NAT.

RFC3918 doesn’t say anything about NATs; it’s about subnets.

Joe
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