pmtu blackhole discovery

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In net/ipv4/tcp_timer.c I find this:

	NOTE. draft-ietf-tcpimpl-pmtud-01.txt requires pmtu black
	hole detection. :-( It is place to make it. It is not made. I do not want
	to make it. It is disguisting. It does not work in any
	case. ...
	
I understand the "people who have broken routers or block ICMP for
security reasons should get their act together" argument.  Beyond
that, what's the argument against it?  Why does the above note claim
"it does not work in any case"?  

Feel free to respond off-list or point me to the FM I should RT if it
exists.

-- 
					thanks,
		
					Will
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