FWIW...

On 1/16/2019 11:26 AM, Tom Herbert wrote:
> ...A stateless firewall could just drop the first fragment that
> contains the transport layer header and allow non first fragments to
> past. This achieves the filtering goal to prevent delivery of the
> reassmbled packet.

That works only if the firewall drop rules are based on information
available in the first fragment. The D in DPI often goes much further.

Joe


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