Subject: Re: PMTUD blackhole detection
To: None <email@example.com>
From: Michael Richardson <firstname.lastname@example.org>
Date: 05/07/2001 09:48:21
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>>>>> "itojun" == itojun <email@example.com> writes:
itojun> we may be able to go through tcb table and mark all the tcp
itojun> connections between the same address pair as "PMTUD broken".
itojun> however, i don't really like this since PMTUD breakage detection
itojun> is way too unreliable. if we have a reliable way to detect PMTUD
itojun> breakge, "mark all connection" approach looks fine for me.
If it has false positives (there is a blackhole), then we waste bandwidth.
If it has false negatives, then we have dead connections.
I know which one that I prefer :-)
If the rate of false positives is very high, then some may argue that this
is equivalent to turning off PMTU, but I'd rather have it on.
] ON HUMILITY: to err is human. To moo, bovine. | firewalls [
] Michael Richardson, Sandelman Software Works, Ottawa, ON |net architect[
] firstname.lastname@example.org http://www.sandelman.ottawa.on.ca/ |device driver[
] panic("Just another NetBSD/notebook using, kernel hacking, security guy"); [
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