Date: Thu, 22 May 2008 14:10:04 GMT From: Maxim Konovalov <maxim@macomnet.ru> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/123881: Turning on TCP blackholing causes slow localhost connections Message-ID: <200805221410.m4MEA4lI093377@freefall.freebsd.org>
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The following reply was made to PR kern/123881; it has been noted by GNATS. From: Maxim Konovalov <maxim@macomnet.ru> To: Tom Karpik <tom@tomkarpik.com> Cc: bug-followup@freebsd.org Subject: Re: kern/123881: Turning on TCP blackholing causes slow localhost connections Date: Thu, 22 May 2008 17:40:35 +0400 (MSD) > Turning on TCP blackholing (sysctl net.inet.tcp.blackhole=2) seems > to make connecting to some local services very slow. > > Example: telnet localhost 25 (default local Sendmail daemon after > fresh installation of FreeBSD) > > Sendmail responds with its greeting string right away if blackholing > is off. If it's turned on, it takes about 8-12 seconds for the > greeting to show up. Just an idea -- sendmail tries to use ident service and just timeouts on it due to tcp blackholing. To check this idea try to run e.g. inetd(8) auth service. -- Maxim Konovalov
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