From: Cesar Eduardo Barros <cesarb@nitnet.com.br>
To: David Schwartz <davids@webmaster.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: TCP keepalive seems to send to only one port
Date: Sat, 23 Dec 2000 22:38:14 -0200 [thread overview]
Message-ID: <20001223223814.A2281@flower.cesarb> (raw)
In-Reply-To: <20001223213156.A1947@flower.cesarb> <NCBBLIEPOCNJOAEKBEAKKEPOMJAA.davids@webmaster.com>
In-Reply-To: <NCBBLIEPOCNJOAEKBEAKKEPOMJAA.davids@webmaster.com>; from davids@webmaster.com on Sat, Dec 23, 2000 at 04:19:31PM -0800
On Sat, Dec 23, 2000 at 04:19:31PM -0800, David Schwartz wrote:
>
> > This means that keepalive is useless for keeping alive more than
> > one connection
> > to a given host.
>
> Actually, keepalive is useless for keeping connections alive anyway. It's
> very badly named. It's purpose is to detect dead peers, not keep peers
> alive.
Then what do you do when you are behind a NAT? And how do you expire entries in
ESTABLISHED state that could stay lingering forever without some sort of
keepalive? (The FINs might have been lost due to a conectivity transient, so
you can have another perfectly valid and alive connection with the same host,
and application-level timeouts are useless for some applications
(*cough*nc*cough*))
--
Cesar Eduardo Barros
cesarb@nitnet.com.br
cesarb@dcc.ufrj.br
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next prev parent reply other threads:[~2000-12-24 1:09 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-23 23:31 Cesar Eduardo Barros
2000-12-24 0:19 ` David Schwartz
2000-12-24 0:38 ` Cesar Eduardo Barros [this message]
2000-12-24 1:52 ` James Morris
2000-12-24 2:20 ` Cesar Eduardo Barros
2000-12-25 15:27 ` Igmar Palsenberg
2000-12-25 14:58 ` Cesar Eduardo Barros
2000-12-26 0:33 ` David Schwartz
2000-12-26 0:46 ` Cesar Eduardo Barros
2000-12-26 0:59 ` David Schwartz
2000-12-24 9:14 ` Andi Kleen
2000-12-24 14:12 ` Cesar Eduardo Barros
2000-12-27 2:00 Bernd Eckenfels
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