From owner-freebsd-net  Tue Jul 10 13:36:17 2001
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Date: Mon, 9 Jul 2001 23:43:18 +0100
From: Richard Smith <rdls@satamatics.com>
To: Luigi Rizzo <luigi@info.iet.unipi.it>
Cc: net@FreeBSD.ORG
Subject: Re: sysctls keepidle and keepintvl
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In-Reply-To: <200107092207.AAA11018@info.iet.unipi.it>; from luigi@info.iet.unipi.it on Tue, Jul 10, 2001 at 12:07:55AM +0200
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On Tue, Jul 10, 2001 at 12:07:55AM +0200, Luigi Rizzo 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.
> 
> whatever is used, isn't the interval in seconds ? If so
> you must be very patient to see something...

No, the tcp sysctls are in ms. Looking through the code, however,
I now understand the relationship between keepidle and keepintvl.

The value of keepidle has been 120 minutes (7200000) since the
beginning of CVS. I was rather hoping to keep a dynamic firewall 
open with keepalives :-) 

So I need to set: keepidle < net.inet.ip.fw.dyn_ack_lifetime.

Problem solved.

Thanks,
Rich.


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