On Jan 6, 2012, at 8:26 PM, Fernando Gont wrote:

> I just said that PLPMTU has a long convergence time

Frankly, that sounds like an implementation issue. If we're willing to set 
IW=10, it seems like one should be able to send the initial burst, or at least 
the first retransmission, with messages of several sizes and see what works. In 
other words, if the MSS is 9K (I wish), send a 9K, a 4K, a 1500 byte IP 
datagram (eg 1440 byte payload), and 1280. If we get an Ack in the subsequent 
RTT acknowledging 8192 bytes, we learned something, and if the only Ack 
acknowledges 1280, we learned something.
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