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

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Date:	Thu, 18 Oct 2012 10:00:44 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Mikael Abrahamsson" <swmike@....pp.se>,
	"Chris Friesen" <chris.friesen@...band.com>
Cc:	"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

> 2. When a network connection (physical interface) goes down, wait a few
> seconds, give up, reset all connectivity related to that connection,
> basically give up.

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.

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.

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

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

	David

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