the TCP MSS resource exhaustion commit

Andre Oppermann andre at
Fri Jan 9 11:35:35 PST 2004

Maxim Konovalov wrote:
> On Fri, 9 Jan 2004, 11:39-0500, Robert Watson wrote:
> [...]
> > I guess my basic worry in this conversation is that fundamentally, the
> > rate detection and "stop" approach is based on a common case heuristic:
> > "Most well behaved applications don't...".  Unfortunately, I have the
> > feeling we're going to run into a lot of exceptions, and while we can
> > improve the heuristic, I can't help but wonder if we shouldn't disable the
> > heuristic by default, and provide better reporting so that sites can tell
> Seconded.  It will be a major PITA if we ship 5.2-R with "broken"

I committed it with default to off for 5.2-R (the disconnect part).


> > if the heuristic *would* enable protection, and then they can optionally
> > turn it on at their choice...  I.e., a console message or sysctl that can
> > be monitored.  It's not hard for me to imagine a lot of RPC content being
> > sent over TCP connections with small packet sizes: multiplexing is a
> > commonly used approach, especially now that every protocol runs over HTTP
> > :-).
> >
> > Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
> > robert at      Senior Research Scientist, McAfee Research
> --
> Maxim Konovalov, maxim at, maxim at

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