Date: Fri, 20 May 2016 16:51:09 +0300 From: Vladimir Zakharov <zakharov.vv@gmail.com> To: Jan Bramkamp <crest@rlwinm.de> Cc: freebsd-current@freebsd.org Subject: Re: CURRENT: ipfw: problems with timeouts and worse network performance Message-ID: <20160520135109.GD2371@vzakharov> In-Reply-To: <38888426-4d91-56ed-9ab3-0d516b0b8d46@rlwinm.de> References: <20160520140152.3ab6fe44@hermann> <20160520125401.GC2371@vzakharov> <38888426-4d91-56ed-9ab3-0d516b0b8d46@rlwinm.de>
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On Fri, May 20, 2016, Jan Bramkamp wrote: > On 20/05/16 14:54, Vladimir Zakharov wrote: > > Hello > > > > On Fri, May 20, 2016, O. Hartmann wrote: > >> I reported earlier about broken pipes in ssh sessions to remote hosts, > >> which occur on an erratic basis. i'm investigating this problem now and > >> it seems that it is also ipfw-related, but I'm not sure. This problem > >> is present since a couple of weeks now. > > > > Maybe this could help... > > > > I've also experienced problems with broken pipes in ssh sessions some > > time ago. Setting in sysctl.conf > > > > net.inet.ip.fw.dyn_ack_lifetime=3600 > > > > fixed problem for me. I didn't experiment with the value though. So, > > possibly, changing default value (300s) to 1 hour is overkill :). > > By default the OpenSSH SSH client is configured to use TCP keepalives. > Those should produce enough packets at a short enough interval to keep > the dynamic IPFW state established. > > Does your traffic pass through libalias? I guess not. How can I be sure? -- Regards, | "In theory there is no difference between theory Vladimir Zakharov | and practice. In practice there is."- Yogi Berra
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