On Tue, 20 Jun 2006, Rick Jones wrote:
....
I thought the ID's even in non-fragmented datagrams gave an idea of how many IP datagrams had been sent along, and so an idea of how "unlikely" it was that a datagram with holes could be reassembled?


Only fragmented datagrams get counted. This is arguably a weakness of the scheme, but it's still a big improvement in practice. And the more common non-fragmented datagram processing doesn't have to pay the price for the extra checks.

--
Arthur

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