Ran,

> In the current global Internet, few router implementers are 
> comfortable trying to reassemble anywhere in the middle of the 
> path,  in part because of the additional attack surface that
> reassembling transit traffic would create.
> 
> Instead, at tunnel egress, any fragments are likely to be 
> merely decapsulated and then forwarded.  So, it is critical 
> that end systems be able to reassemble fragments as fragments 
> will continue to exist in the real world.

that would also be a significant change in the IPv6 architecture.
IPv6 over IPv6 tunnels do outer fragmentation today (RFC2473) and tunnel egress 
must perform reassembly.

cheers,
Ole
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