netdev - Re: [PATCH 1/1] ipv4: arp: update neighbour address when a gratuitous arp is received and arp

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Message-Id: <20140101.233834.1721631702711130638.davem@davemloft.net>
Date:	Wed, 01 Jan 2014 23:38:34 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	noureddine@...stanetworks.com
Cc:	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, hannes@...essinduktion.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] ipv4: arp: update neighbour address when a
 gratuitous arp is received and arp_accept is set

From: Salam Noureddine <noureddine@...stanetworks.com>
Date: Tue, 24 Dec 2013 14:17:02 -0800

> Gratuitous arp packets are useful in switchover scenarios to update
> client arp tables as quickly as possible. Currently, the mac address
> of a neighbour is only updated after a locktime period has elapsed
> since the last update. In most use cases such delays are unacceptable
> for network admins. Moreover, the "updated" field of the neighbour
> stucture doesn't record the last time the address of a neighbour
> changed but records any change that happens to the neighbour. This is
> clearly a bug since locktime uses that field as meaning "addr_updated".
> With this observation, I was able to perpetuate a stale address by
> sending a stream of gratuitous arp packets spaced less than locktime
> apart. With this change the address is updated when a gratuitous arp
> is received and the arp_accept sysctl is set.
> 
> Signed-off-by: Salam Noureddine <noureddine@...stanetworks.com>

This patch doesn't apply, please regenerate this patch against current
sources.
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