On Aug 1, 2007, at 5:01 AM, Iljitsch van Beijnum wrote:
Rethinking the type of MTU detection packets: a new mechanism that must be supported by both sides, or something that can be implemented by just one side?
see previous note. I don't think the mechanism has to even be known to both sides necessarily, just observable by the side that needs the answer.
One way to implement RFC 4821 would be to literally send each of the enumerated segment sizes in the first burst (send n segments, of sizes 9000, 8192, 4096, 2048, 1500, 1460, 1400, and 1280, and see how much data is acknowledged in the first acknowledgment). One could imagine the same kind of thing happening here. If I send you an ARP request in a 9K byte packet, will you care? You will no doubt respond with the same packet you would have normally. But in doing so, you will have demonstrated that you received the 9K-gram.
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