From mboxrd@z Thu Jan  1 00:00:00 1970
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
In-reply-to: Your message of "Sun, 06 Mar 2011 22:34:03 EST."
	<6691dddb8f174a82cf2fb78e65157385@brasstown.quanstro.net>
References: <AANLkTin0pRmWzRuJJaq5Z7ELNvxqUa4DM6iFWw8OgTqk@mail.gmail.com>
	<58b61128ec119c9e719f198844449401@brasstown.quanstro.net>
	<20110307033134.E0E7DB835@mail.bitblocks.com>
	<6691dddb8f174a82cf2fb78e65157385@brasstown.quanstro.net>
Date: Sun,  6 Mar 2011 20:15:08 -0800
From: Bakul Shah <bakul@bitblocks.com>
Message-Id: <20110307041508.38B9EB827@mail.bitblocks.com>
Subject: Re: [9fans] drawterm dies when my mac book sleeps by 9p design?
Topicbox-Message-UUID: b795a312-ead6-11e9-9d60-3106f5b1d025

On Sun, 06 Mar 2011 22:34:03 EST erik quanstrom <quanstro@quanstro.net>  wrote:
> > > there may be some controls determining how soon to turn
> > > off the wifi that may be of some help.
> >
> > You don't need to mess with the wifi.  Just do
> >
> > $ sysctl -w net.inet.tcp.always_keepalive=0
> >
> > This will prevent the stack from sending any keepalive packets
> > on its own.  But this will *not* help if the higher level
> > protocol generates such packets.
>
> i don't think that does what you think it does.  the timers
> on the plan 9 side will keep running.

Don't know about plan9.

This setting works for ssh, xterm etc. between *BSD/Mac and I
think Linux (Windows forcibly terminates everything when the
link goes down -- there may be a setting to disable keepalives
but I try not to know more about Windows).

>>From RFC1122:

         4.2.3.6  TCP Keep-Alives

            Implementors MAY include "keep-alives" in their TCP
            implementations, although this practice is not universally
            accepted.  If keep-alives are included, the application MUST
            be able to turn them on or off for each TCP connection, and
            they MUST default to off.