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 - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html