>> 	on PR 12790, I posted a simple patch for TCP PMTUD blackhole detection.
>> 	if there's no ack for a while, the patch will do the following:
>[...]
>
>What if there is no ACK, but ICMP unreachable errors that are not
>"need fragmentation" - will they reset the timer (I think they should) ?

	i did not change that part of the codepath.  icmp unreachables will
	be counted, and if the count reaches maximum, the connection will
	be terminated.

itojun