netdev - RE: Bug? TCP shutdown behaviour when deleting local IP addresses

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Date:	Thu, 18 Oct 2012 12:00:23 +0200 (CEST)
From:	Mikael Abrahamsson <swmike@....pp.se>
To:	David Laight <David.Laight@...LAB.COM>
cc:	Chris Friesen <chris.friesen@...band.com>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Patrick McHardy <kaber@...sh.net>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: RE: Bug?  TCP shutdown behaviour when deleting local IP addresses

On Thu, 18 Oct 2012, David Laight wrote:

> Doing that is almost pointless and gives people false expectations.
>
> Consider the simple network host-hub-hub-host.
> If you disconnect the link between the two hubs then
> only timeouts can cause disconnects.
> Such a remote fault is much more likely than the local one.

My doing suspect/resume on my laptop causes more network interruptions 
than any link going down in the network outside my home.

> If the kernel takes down connections when a local interface
> goes down (as windows does) then people doing testing
> fail to test the correct scenario.

I never asked for the kernel to take down connections, I asked for the 
connection manager to be able to do it.

> You also don't want a power glitch in the wiring cupboard to disconnect 
> all your connections.

In a server environment, most likely you're right. In some other 
environment, the opposite probably applies.

> In the past I've also moved IP addresses between physical
> interfaces - modern HA systems might do the same.

Yes, in your described scenario you're right, in my scenario (laptop 
suspend/resume) I don't agree with your view.

-- 
Mikael Abrahamsson    email: swmike@....pp.se
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