From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1M19ZA-0004Sz-Lc
	for qemu-devel@nongnu.org; Mon, 04 May 2009 21:35:28 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1M19Z6-0004SF-12
	for qemu-devel@nongnu.org; Mon, 04 May 2009 21:35:28 -0400
Received: from [199.232.76.173] (port=38092 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1M19Z5-0004SC-Ty
	for qemu-devel@nongnu.org; Mon, 04 May 2009 21:35:23 -0400
Received: from mail2.shareable.org ([80.68.89.115]:60027)
	by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32)
	(Exim 4.60) (envelope-from <jamie@shareable.org>) id 1M19Z5-0005Xn-ES
	for qemu-devel@nongnu.org; Mon, 04 May 2009 21:35:23 -0400
Date: Tue, 5 May 2009 02:35:21 +0100
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] PATCH: enabling TCP keepalives - v3
Message-ID: <20090505013521.GC12731@shareable.org>
References: <49F9FEBA.6050901@gmail.com>
	<20090501113204.GA10763@amd.home.annexia.org>
	<49FAEFDD.2070002@gmail.com> <20090501152312.GH13308@redhat.com>
	<49FB1AC3.2040804@redhat.com> <49FB1F3C.8080805@oracle.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <49FB1F3C.8080805@oracle.com>
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: John Haxby <john.haxby@oracle.com>
Cc: qemu-devel@nongnu.org, "Richard W.M. Jones" <rjones@redhat.com>, Avi Kivity <avi@redhat.com>, David Ahern <dsahern@gmail.com>

John Haxby wrote:
> Connection tracking devices often have a 10 minute timeout for idle 
> connections -- the connection will magically evaporate after 600s of 
> idle time.

Oh if only.  I've seen NATs which expire after about 20 seconds.  My
VPN is configured to send NAT-keepalive pings every 15 seconds because
of that.

> For those people that have seriously dodgy VPN connections that no 
> amount of keepalive will keep up, they need some alternative.   Probably 
> starting with a new VPN :-)

Interesting perspective on VPNs.  I use a VPN sometimes because it's
more stable than the underlying network and keeps TCP connections
going where the underlying network would not :-)

-- Jamie