From owner-freebsd-net  Tue Jul 10  2:34:28 2001
Delivered-To: freebsd-net@freebsd.org
Received: from whale.sunbay.crimea.ua (whale.sunbay.crimea.ua [212.110.138.65])
	by hub.freebsd.org (Postfix) with ESMTP id B9F1237B405
	for <net@FreeBSD.ORG>; Tue, 10 Jul 2001 02:01:51 -0700 (PDT)
	(envelope-from ru@whale.sunbay.crimea.ua)
Received: (from ru@localhost)
	by whale.sunbay.crimea.ua (8.11.2/8.11.2) id f6A91Un06470;
	Tue, 10 Jul 2001 12:01:30 +0300 (EEST)
	(envelope-from ru)
Date: Tue, 10 Jul 2001 12:01:30 +0300
From: Ruslan Ermilov <ru@FreeBSD.ORG>
To: Richard Smith <rdls@satamatics.com>
Cc: net@FreeBSD.ORG
Subject: Re: sysctls keepidle and keepintvl
Message-ID: <20010710120130.A5467@sunbay.com>
Mail-Followup-To: Richard Smith <rdls@satamatics.com>,
	net@FreeBSD.ORG
References: <20010709230512.A918@gaia.home.rdls.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.2.5i
In-Reply-To: <20010709230512.A918@gaia.home.rdls.net>; from rdls@satamatics.com on Mon, Jul 09, 2001 at 11:05:13PM +0100
Sender: owner-freebsd-net@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-net.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo?subject=subscribe%20freebsd-net>
List-Unsubscribe: <mailto:majordomo?subject=unsubscribe%20freebsd-net>
X-Loop: FreeBSD.org

On Mon, Jul 09, 2001 at 11:05:13PM +0100, Richard Smith wrote:
> Please cc me, as I'm not on this list.
> 
> I am using 4.3-RELEASE, and investigating why I don't see
> any keepalives (using tcpdump) on my connections.
> 
> The default values are as follows:
> 	net.inet.tcp.keepidle = 7200000
> 	net.inet.tcp.keepintvl = 75000
> 
> It seems to me that the keepalive interval is being set
> by keepidle, thus setting keepidle = 20000, generates 
> keepalives at 20s intervals.
> 
> Looking at the comments in tcp_var.h, it should be 
> keepintvl that sets this interval. Otherwise, why
> have such a large value for keepidle?
> 
> Is this a bug? Or have I missed something,
> 
Only TCP sockets marked with SO_KEEPALIVE setsockopt(2) will
be kept alive.  Alternatively, you can enable this option on
all sockets implicitly by net.inet.tcp.always_keepalive=1.
(Or by setting tcp_keepalive rc.conf(5) variable to "YES").


Cheers,
-- 
Ruslan Ermilov		Oracle Developer/DBA,
ru@sunbay.com		Sunbay Software AG,
ru@FreeBSD.org		FreeBSD committer,
+380.652.512.251	Simferopol, Ukraine

http://www.FreeBSD.org	The Power To Serve
http://www.oracle.com	Enabling The Information Age

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-net" in the body of the message